Question

Question no 20……………………….

Answer 1

Answer:

a^3 + b^3 = a^3 + ab^2 - a^2b + b^3 + a^2b - ab^2 = a(a^2 + b^2 - ab) + b(a^2 + b^2 - ab) = (a + b)(a^2 + b^2 - ab)

Answer 2

Answer:

$3 > - 6 \\ 3 -( - 6) \\ d(ab) = 3$