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Trying to do maths homework (revision) I cannot do it and I have wund myself up into a state where I 'know' I am going to fail my GCSE and work in Burger King for the rest of my life, any help would be appreciated if you show me how you got the answers, thanks.
1. Find correct to 2 decimal places, the solutions of the equation
x² - 3x – 3 = 0
You must show working, do not use trial and improvement method
10 a) Calculate 651.6 – 4.02 / 7 – 8.2²
10 b) Using indices, write 392 as a product of its prime factors
12 a) solve the equation “6(x + 2) = 2x – 6
12 c) Make “d” the subject of the formula
S = ½ xd²
1. Find correct to 2 decimal places, the solutions of the equation
x² - 3x – 3 = 0
You must show working, do not use trial and improvement method
10 a) Calculate 651.6 – 4.02 / 7 – 8.2²
10 b) Using indices, write 392 as a product of its prime factors
12 a) solve the equation “6(x + 2) = 2x – 6
12 c) Make “d” the subject of the formula
S = ½ xd²
Page:
only just read this, looks like you got the answers but if you need more help just ask, also add me to yuor msn list and i'll help you step by step
[email protected]
[email protected]
Thanks for the help guys, my maths teacher sucks and I am going to have to see her about why the hell I dont know what she is meant to have taught me!
Parr wrote:
> 1. Find correct to 2 decimal places, the solutions of the equation
>
> x2 - 3x – 3 = 0
>
> (X - 3)(X + 1) = 0 (start by factorising)
That multiplies out to give x^2 +x -3x -3 which equals x^2 -2x -3.
You need to use the formula which is something like -b ± root(b^2-4ac)/2a
> 10 a) Calculate 651.6 – 4.02 / 7 – 8.22
>
> Right, here I think you are supposed to use estimates. If I am wrong
> then sorry but I will use estimates anyway :P. If not correct me and I
> will try and do it again.
It says calculate not estimate, so written exactly like that it comes to...
651.6 - 8.7942 (do the division first unless there are brackets somewhere) which is 642.81 (2dp)
> 1. Find correct to 2 decimal places, the solutions of the equation
>
> x2 - 3x – 3 = 0
>
> (X - 3)(X + 1) = 0 (start by factorising)
That multiplies out to give x^2 +x -3x -3 which equals x^2 -2x -3.
You need to use the formula which is something like -b ± root(b^2-4ac)/2a
> 10 a) Calculate 651.6 – 4.02 / 7 – 8.22
>
> Right, here I think you are supposed to use estimates. If I am wrong
> then sorry but I will use estimates anyway :P. If not correct me and I
> will try and do it again.
It says calculate not estimate, so written exactly like that it comes to...
651.6 - 8.7942 (do the division first unless there are brackets somewhere) which is 642.81 (2dp)
Kyz22 wrote:
> Yes it is total f*cking b*llocks, it is irrelevent to any future
> career path I may ever consider and it makes no sense whatsoever. I
> cannot wait until I get my E+ and never have to do any of it again,
> but for now, I will try a bit...
I was not too happy on thursday when i got my maths results back for my first maths exam, i got an f, with d deing the highest and e being a pass... so i passed, but i still felt like crap...
But i am planning on being a cop, so i really only need english and good driving...
> Yes it is total f*cking b*llocks, it is irrelevent to any future
> career path I may ever consider and it makes no sense whatsoever. I
> cannot wait until I get my E+ and never have to do any of it again,
> but for now, I will try a bit...
I was not too happy on thursday when i got my maths results back for my first maths exam, i got an f, with d deing the highest and e being a pass... so i passed, but i still felt like crap...
But i am planning on being a cop, so i really only need english and good driving...
> 12 c) Make “d” the subject of the formula
> S = ½ xd²
(Get rid of the ½)
2S = xd²
2S / x = d²
d = [SQUARE ROOT](2S / x)
Silly Forums :P
> S = ½ xd²
(Get rid of the ½)
2S = xd²
2S / x = d²
d = [SQUARE ROOT](2S / x)
Silly Forums :P
Kyz22 wrote:
I'm not going to give answers as I'm not gonna do your homework for you as it aint gonna help you at all. If you don't understand as your teacher or someone in your class who does to show you.
anyway....
> 1. Find correct to 2 decimal places, the solutions of the equation
>
> x² - 3x – 3 = 0
>
Quadratic equation get used for this one I think...
> 12 a) solve the equation “6(x + 2) = 2x – 6
seems straight forward, multiply out the braket and move the things with an x before it to one side and the constants to the other side and work out what values of x solve it.
All the others require too much thought and its been years since I did any of this.
I'm not going to give answers as I'm not gonna do your homework for you as it aint gonna help you at all. If you don't understand as your teacher or someone in your class who does to show you.
anyway....
> 1. Find correct to 2 decimal places, the solutions of the equation
>
> x² - 3x – 3 = 0
>
Quadratic equation get used for this one I think...
> 12 a) solve the equation “6(x + 2) = 2x – 6
seems straight forward, multiply out the braket and move the things with an x before it to one side and the constants to the other side and work out what values of x solve it.
All the others require too much thought and its been years since I did any of this.
OK Mate here goes.
Kyz22 wrote:
> Trying to do maths homework (revision) I cannot do it and I have wund
> myself up into a state where I 'know' I am going to fail my GCSE and
> work in Burger King for the rest of my life, any help would be
> appreciated if you show me how you got the answers, thanks.
>
>
> 1. Find correct to 2 decimal places, the solutions of the equation
>
> x² - 3x – 3 = 0
(X - 3)(X + 1) = 0 (start by factorising)
Either X - 3 = 0 OR X + 1 = 0
X = 3 OR X = -1
> You must show working, do not use trial and improvement method
>
> 10 a) Calculate 651.6 – 4.02 / 7 – 8.2²
Right, here I think you are supposed to use estimates. If I am wrong then sorry but I will use estimates anyway :P. If not correct me and I will try and do it again.
650 - 4 / 7 - 8²
650 - 4 / 7 - 64
650 - 4 / - 57
650 - 4 / - 60 (estimation still)
650 - 0.666
= 649.3
> 10 b) Using indices, write 392 as a product of its prime factors
7³ + 7²
> 12 a) solve the equation “6(x + 2) = 2x – 6
(Multiply out the bracket first)
6x + 12 = 2x - 6
6x - 2x + 12 = -6
4x = -6 - 12
4x = -18
X = -4.5
> 12 c) Make “d” the subject of the formula
> S = ½ xd²
(Get rid of the ½)
2S = xd²
2S / x = d²
d = √(2S / x)
Hope this helps mate. If you need to ask any more help, just email me or chat on MSN! :)
Kyz22 wrote:
> Trying to do maths homework (revision) I cannot do it and I have wund
> myself up into a state where I 'know' I am going to fail my GCSE and
> work in Burger King for the rest of my life, any help would be
> appreciated if you show me how you got the answers, thanks.
>
>
> 1. Find correct to 2 decimal places, the solutions of the equation
>
> x² - 3x – 3 = 0
(X - 3)(X + 1) = 0 (start by factorising)
Either X - 3 = 0 OR X + 1 = 0
X = 3 OR X = -1
> You must show working, do not use trial and improvement method
>
> 10 a) Calculate 651.6 – 4.02 / 7 – 8.2²
Right, here I think you are supposed to use estimates. If I am wrong then sorry but I will use estimates anyway :P. If not correct me and I will try and do it again.
650 - 4 / 7 - 8²
650 - 4 / 7 - 64
650 - 4 / - 57
650 - 4 / - 60 (estimation still)
650 - 0.666
= 649.3
> 10 b) Using indices, write 392 as a product of its prime factors
7³ + 7²
> 12 a) solve the equation “6(x + 2) = 2x – 6
(Multiply out the bracket first)
6x + 12 = 2x - 6
6x - 2x + 12 = -6
4x = -6 - 12
4x = -18
X = -4.5
> 12 c) Make “d” the subject of the formula
> S = ½ xd²
(Get rid of the ½)
2S = xd²
2S / x = d²
d = √(2S / x)
Hope this helps mate. If you need to ask any more help, just email me or chat on MSN! :)
Kyz22 wrote:
>
> 12 c) Make “d” the subject of the formula
>
> S = ½ xd²
Can't be bothered to do the others but this one dosn't need much thought.
Just put everything on the other side.
ie to start. To get the half on the other side you would divide each side by a half (same as multiplying by 2)
So you get
2S = xd(squared)
then divide each side by x and square root both sides.
>
> 12 c) Make “d” the subject of the formula
>
> S = ½ xd²
Can't be bothered to do the others but this one dosn't need much thought.
Just put everything on the other side.
ie to start. To get the half on the other side you would divide each side by a half (same as multiplying by 2)
So you get
2S = xd(squared)
then divide each side by x and square root both sides.
I hate to say this, but why the heck would anyone need to know any of that rubbish. Algebra is the most pointless thing on the planet, apart from Busted of course.
:)
:)
Trying to do maths homework (revision) I cannot do it and I have wund myself up into a state where I 'know' I am going to fail my GCSE and work in Burger King for the rest of my life, any help would be appreciated if you show me how you got the answers, thanks.
1. Find correct to 2 decimal places, the solutions of the equation
x² - 3x – 3 = 0
You must show working, do not use trial and improvement method
10 a) Calculate 651.6 – 4.02 / 7 – 8.2²
10 b) Using indices, write 392 as a product of its prime factors
12 a) solve the equation “6(x + 2) = 2x – 6
12 c) Make “d” the subject of the formula
S = ½ xd²
1. Find correct to 2 decimal places, the solutions of the equation
x² - 3x – 3 = 0
You must show working, do not use trial and improvement method
10 a) Calculate 651.6 – 4.02 / 7 – 8.2²
10 b) Using indices, write 392 as a product of its prime factors
12 a) solve the equation “6(x + 2) = 2x – 6
12 c) Make “d” the subject of the formula
S = ½ xd²
Page: