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# Partial fraction watch

1. im gonna sound like an idiot but my answers never turn out for questions when the denominator is JUST a ^x term eg.
2x/(x+2)^2

i can do it when its say 2x/(x-2)(x+2)^2

2. (Original post by kashif_k)
im gonna sound like an idiot but my answers never turn out for questions when the denominator is JUST a ^x term eg.
2x/(x+2)^2

i can do it when its say 2x/(x-2)(x+2)^2

3. (Original post by Gaz031)

i know i gotta do that. But i substitute radom number in the form to equations and then take them away form each other abolishing either A or B. but my answer never turns out to be correct. Am i doing something wrong?
4. (Original post by kashif_k)
i know i gotta do that. But i substitute radom number in the form to equations and then take them away form each other abolishing either A or B. but my answer never turns out to be correct. Am i doing something wrong?
Multiply everything by (X+2)², cancel down, then equate the co-efficients.

2x = Ax + 2A + B

A = 2

2(2) + B = 0

B = -4

I think that's right.
5. (Original post by kashif_k)
im gonna sound like an idiot but my answers never turn out for questions when the denominator is JUST a ^x term eg.
2x/(x+2)^2
6. oooopppps!! just realised what it is i do wrong!! im such a plum, i forgot that i dont need to B/(x+2)^2 by anything, what i was doing was this

2x =A(x+2)^2 + B(x+2)

DOH!!!

thank for helping me out

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