# Question #42fd5

Nov 9, 2016

$x = - 2$

#### Explanation:

The zero / root of f(x) is the value of x that makes f(x) = 0.

That is solve 2x + 4 = 0

subtract 4 from both sides of the equation.

$2 x \cancel{+ 4} \cancel{- 4} = 0 - 4$

$\Rightarrow 2 x = - 4$

To solve for x, divide both sides by 2.

$\frac{\cancel{2} x}{\cancel{2}} = \frac{- 4}{2}$

$\Rightarrow x = - 2 \text{ is the zero of f(x)}$