Question

check whether the (x+2) whole cube = 2x(x square - 1

Answer 1

( x + 2 )^2 = 2x ( x^2 - 1 )

( x + 2 )^2 = x^2 + 4 + 2x

2x ( x^2 - 1 ) = 2x^3 - 2x

2x^2 + 4 + 2x is not equal to 2x^3 - 2x

so ( x + 2 )^2 is not equal to 2x ( x^2 - 1 )

Answer 2

First apply the formula

${ (a + b )}^{3}$

for

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