# Question #277ac

Apr 7, 2017

$= {x}^{2} - 4$

#### Explanation:

Foil $\left(x - 2\right) \left(x + 2\right)$,

$= {x}^{2} + 2 x - 2 x - 4$

Collect like terms,

$= {x}^{2} - 4$

Apr 7, 2017

Last term is $- 4$

#### Explanation:

The "Last" term in the the product will be the product of the two last terms in each bracket.

It is not necessary to find the whole product.

$\left(x - \textcolor{red}{2}\right) \left(x + \textcolor{red}{2}\right)$

$\textcolor{red}{- 2 \times + 2} = - 4$