LHS AND RHS.. Surely thats Congruency, thats got nothing to do with it :/
And i think your workings are right the answer is a=2 b-4 So you are going about it the right way i think.. The markschweme says 32=8b :/
I would have thought it has everything to do with it. You're not solving the equation, you're making it valid with particular values for a and b, so the right thing to do would be to say the LHS should be equivalent to the RHS?
And the markscheme would say that because it's comparing the coefficients of the x terms, you don't need to write in the xs
Im ****in gassed boy mans gonna get A* in additionalansj matrhs. and i rock beccuseje i go to skengeness bitches haaa dey got paper for me n i no questions !!!!