Question

if p=4-q, prove that p3+.q3+12pq=64

Answer 1

p=4-q
p + q = 4

(p + q)^3 = 64

p^3 + q^3 + 3pq (p + q) = 64

p^3 + q^3 + 3pq(4) = 64

p^3 + q^3 + 12pq = 64