# How do you multiply (4+x)(4-x)?

Aug 3, 2016

#### Answer:

$16 - {x}^{2}$

#### Explanation:

$\left(4 + x\right) \left(4 - x\right)$ $=$ $4 \left(4 - x\right) + x \left(4 - x\right)$

$=$ $16 - \cancel{4 x} + \cancel{4 x} - {x}^{2}$

$=$ $- {x}^{2} + 16$