Question

Stevin product Calculate (x + 9) (x + 12): a)x² - 21x - 108 b)x² - 21x + 108 c)x² + 21x + 108 d)x² + 21x - 108 e)x² - 21x - 108

Answer 1

The answer is C.

Explanation:

You have to apply Distributive Law :

`a(m + n) = am + an`

So for this question :

`(x + 9)(x + 12)`

`= x(x) + x(12) + 9(x) + 9(12)`

`= {x}^(2) + 12x + 9x + 108`

`= {x}^(2) + 21x + 108`