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# FP1 Algebra Problem watch

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1. Hi, I have this question from an FP1 Chapter Assessment, and I've managed to do all of the other questions but for some reason, I can't seem to figure out this one even though it's easier compared to the others.
The Question: Find the values of the unknown constants in this identity:
3x-2=P(x+1)^2+Q(x+1)(x-3)+R(x-3)^2
Any help would be much appreciated! Thank you
2. Expand each bracket and then equate coefficients. This should form 3 equations that you can then solve simultaneously. (I haven't tried the question so I don't know how it would come out exactly)
3. (Original post by XmayaX)
Hi, I have this question from an FP1 Chapter Assessment, and I've managed to do all of the other questions but for some reason, I can't seem to figure out this one even though it's easier compared to the others.
The Question: Find the values of the unknown constants in this identity:
3x-2=P(x+1)^2+Q(x+1)(x-3)+R(x-3)^2
Any help would be much appreciated! Thank you
substitute values to make x+1=0 and x-3=0 to find P and R then equate coefficients to find Q
4. (Original post by kieran12321LFC)
substitute values to make x+1=0 and x-3=0 to find P and R then equate coefficients to find Q
Hiya, thanks so much for the help but I realised that I needed to do that, I'd just been trying to equate the coefficients which was pretty complicated!

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Updated: January 30, 2016
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