# Question #edb58

Jan 7, 2018

$12 {x}^{2} - 7 x - 12$

#### Explanation:

Expand the brackets by simply multiplying each term by the other term in the other brackets.

$\therefore$

$3 x \cdot 4 x = 12 {x}^{2}$

$3 x \cdot 3 = 9 x$

$- 4 \cdot 4 x = - 16 x$

$- 4 \cdot 3 = - 12$

Putting this together gives $12 {x}^{2} + 9 x - 16 x - 12$ which simplifies to $12 {x}^{2} - 7 x - 12$.