Question

expand using identities
16x^4 + 54x

Answer 1

2x (8x^3+27)

$2x[ ( {2x})^{3} + {3}^{3} ]$

Using identity => a^3+b^3=(a+b)(a^2-ab+b^2)

Here, a=2x and b=3

$2x(2x + 3)(4 {x}^{2} - 6x + 9)$