# maths coursework help!

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#1
hey! i have this quadratic which i'm not sure how to solve. it is -8a+4a over 24, or -8a-4a over 24. I think the answer is a over 6 and a over 2 but im not sure! is there any braniacs out there who can help-as my teacher refuses, and my usual braniac friend is sick! ta very much!
0
17 years ago
#2
(-8a+4a)/24 = -4a/24 = -a/6

(-8-4a)/24 = -12a/24 = -a/2

0
17 years ago
#3
(Original post by Tammi)
hey! i have this quadratic which i'm not sure how to solve. it is -8a+4a over 24, or -8a-4a over 24. I think the answer is a over 6 and a over 2 but im not sure! is there any braniacs out there who can help-as my teacher refuses, and my usual braniac friend is sick! ta very much!
In order to be solvable there must be an = sign in it else it becomes an algebraic expression
if you could repost the full question or email it through, there's plenty of help out here.
0
17 years ago
#4
(Original post by Tammi)
hey! i have this quadratic which i'm not sure how to solve. it is -8a+4a over 24, or -8a-4a over 24. I think the answer is a over 6 and a over 2 but im not sure! is there any braniacs out there who can help-as my teacher refuses, and my usual braniac friend is sick! ta very much!
The expressions you have given look very familiar, much like the quadratic equation.

x=(-b +/- (b^2-4ac)^0.5)/2a

So b=8a, b^2-4ac=16a^2 and 2a=24.

a=12
b=96
b^2-4ac=2304 >>> -4ac=2304-9216=-6912 >>> c=-6912/-4a=144

x^2+8x+12=0 >>> (x+6)(x+2)=0 so x=-2 or -6.

Am I good or what!!!
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17 years ago
#5
I'm so glad i didn't take maths this year, i get a headache just looking at it
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