Could someone please check my maths working out? Watch

kandykissesxox
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hi please could somebody check my answers and help me on question 8a 8b, 10a, 11 a, 11b 11c 11d and 12a 12b

Thank you
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hukdealz
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seems all correct to me (well all of what's there)
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TeeEm
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(Original post by hukdealz)
seems all correct to me (well all of what's there)
lol
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kandykissesxox
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TE=kandykissesxox;51292939]hi please could somebody check my answers and help me on question 6b, 8a 8b, 11 a, 11b 11c 11d and 12a 12b

Thank you[/QUOTE]
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kandykissesxox
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TIATA
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(Original post by kandykissesxox)
...
You've done some questions wrong. 2a, 2b, 3b, 5a, 5b, 6a - you forgot the minus sign- and I don't think you did the second part of q6

I'll look at the rest and try to help you.
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Wahrheit
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Not bothered reading it all, but looking at 1b, if an = 100 and a = -8 then n would be something completely different, not 37. The answer is right, but you seem to have confused a and d a few times then somehow it's worked out ok, or your 'a's and 'd's look too similar
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kandykissesxox
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(Original post by Wahrheit)
Not bothered reading it all, but looking at 1b, if an = 100 and a = -8 then n would be something completely different, not 37. The answer is right, but you seem to have confused a and d a few times then somehow it's worked out ok, or your 'a's and 'd's look too similar
sorry about that, yes my a's and d's are similar.
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kandykissesxox
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(Original post by TIATA)
You've done some questions wrong. 2a, 2b, 3b, 5a, 5b, 6a - you forgot the minus sign- and I don't think you did the second part of q6

I'll look at the rest and try to help you.
Ok thank you!
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Wahrheit
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(Original post by kandykissesxox)
sorry about that, yes my a's and d's are similar.
Ah ok no probs, my 'x' and 'n' look identical lol
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Shakz
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(Original post by kandykissesxox)
hi please could somebody check my answers and help me on question 8a 8b, 10a, 11 a, 11b 11c 11d and 12a 12b

Thank you
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Shakz
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(Original post by kandykissesxox)
hi please could somebody check my answers and help me on question 8a 8b, 10a, 11 a, 11b 11c 11d and 12a 12b

Thank you
I'll give you an A for effort!
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TIATA
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(Original post by kandykissesxox)
Ok thank you!
For 8a, you can set up sim equations.

you now the formula for the nth term, and that a = 4x - 5, so use it with n=2 and n= 3 to set up two equations.

8b is simple once you know what x is.

For 10b, you can complete the square
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kandykissesxox
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(Original post by TIATA)
For 8a, you can set up sim equations.

you now the formula for the nth term, and that a = 4x - 5, so use it with n=2 and n= 3 to set up two equations.

8b is simple once you know what x is.

For 10b, you can complete the square
i spent half an hour on 10b I tried the quad equation and completing the square. I could not do it, which is really frustrating
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TIATA
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(Original post by kandykissesxox)
i spent half an hour on 10b I tried the quad equation and completing the square. I could not do it, which is really frustrating
You know Sn = 444, a = 4, and d = 6.

n/2 [2 * 4 + (n-1)6] = 444

mutiply both sides by 2 and expand the left hand side.

8n + 6n^2 - 6n = 888

Simplify the left hand side and divide everything by 6.

n^2 + 1/3n = 148

complete the square and you get n = 12 as one of your solutions.
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