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p2+2pq+q2=1
MRS = |-p1/p2|
Even
p2 - 8p = 0 The square would be (8/2)2 = 42 = 16 So, p2 - 8p + 16 = 16 then (p - 4)2 = 42 So that (p - 4) = +/- 4 then p = 4 +/- 4 ie p = 8 or p = 0 With this particular question, factorisation is so much easier: p2 - 8p = 0 p(p - 8) = 0 So p = 0 or p = 8 Done!
3 and p2 are both factors of each part of the binomial, so divide it from each part and see what you have left. (3p4 / 3p2) - (12p2 / 3p2) (3p2)(p2-4)◄