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Help with maths!

werto165
By werto165
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Posted (edited)

I've got this question about partial fractions and im wondering how to do it. 

 

(9x^2+20x-10)/(x+2)(3x-1) 

 

I've done long division and calculated that the equation is =

 

3+ (5x-4)/(x+2)(3x-1)

 

From this do I do

 

3+ (5x-4)/(x+2)(3x-1)=A(3x-1)/(x+2) + B(x+2)/(3x-1)  

 

or this: 

 

(5x-4)/(x+2)(3x-1)=A(3x-1)/(x+2) + B(x+2)/(3x-1)

 

I've worked it out, it was the latter.

Edited by werto165

CPU: Intel 3570 GPUs: Nvidia GTX 660Ti Case: Fractal design Define R4  Storage: 1TB WD Caviar Black & 240GB Hyper X 3k SSD Sound: Custom One Pros Keyboard: Ducky Shine 4 Mouse: Logitech G500

 

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Posted

Why you doing this to me?

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Posted
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Are you trying to solve for x?

Nope I trying to solve for A and B which is done by substituting x=-2 and x=1/3. I've worked it out now anyway.

CPU: Intel 3570 GPUs: Nvidia GTX 660Ti Case: Fractal design Define R4  Storage: 1TB WD Caviar Black & 240GB Hyper X 3k SSD Sound: Custom One Pros Keyboard: Ducky Shine 4 Mouse: Logitech G500

 

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Posted

You use the second one to calculate the values of A and B, but you still need to include the 3 in your final answer.

 

I can't believe someone had a somewhat legit math problem on these forums. Usually it's like 8-10th grade math, whereas this was like 1st year uni level.

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