Question

If a and b are zeros of polynomial 2x square - 3+7 find the value of a cube + b cube

Answer 1

2x^2-3x+7

a= 2
b= -3

a^3+b^3
= a^3+b^3+3ab(a+b)
= 2^3+(-3)^3+3×2×-3{2+(-3)}
= 8-27-18(-1)
= -19+18
= -1