Question

a + b square is equals to a minus b whole power 4+4ab

Answer 1

(a-b)^4 = [(a-b)^2]^2 = [a^2 + b^2 - 2ab]*[a^2 + b^2 - 2ab]

=[a4 +a2b2 - 2(a3b) + a2b2 + b4 - 2(ab3) - 2(a3b) - 2(ab3) + 4(a2b2)]

= [a4 +b4 - 4(a3b) - 4(ab3) + 6(a2b2)]

Answer 2

(a+b)^2=a^2+b^2+2ab=a^+b^2+(-2ab+2ab)+2ab=a^2+b^2-2ab+4ab=(a-b)^2+4ab