Question

If a = (x-3) and b = (x+3), show that 2ab = 2x square - 18

Answer 1

Explanation:

ab = (x - 3)(x + 3)

multiply

ab = x² + 3x - 3x - 9

Simplify

ab = x² - 9

---------------------------

2ab = 2(x² - 9)

Distribute

2ab = 2x² - 18