Question

Coefficient of x2in (x2+2)^3

Answer 1

( x² + 2)³

=( x²)³ + 2³ + 3x²×2 (x²+2)

= x⁶+ 8 + 6x²( x²+2)

= x⁶+8 + 6x⁴ +12 x²

therefore, coefficient of x² is 12.

hope it helps you out....