Question

Louise completed the work shown below.

Answer 1

I hope this helps you

Answer 2

The answer is incorrect.

The square of binomials is:
(a + b)² = a² + 2ab + b

In (5x³ + 3)², a = 5x³ and b = 3

Substitute it in the formula for the square of binomials:
 (5x³ + 3)² = (5x³)² + 2 * 5x³ * 3 + 3² = 
                 = 25x⁶ + 10x³ + 9

Louise’s answer is 25x⁶ + 9, which is incorrect.