### Home > PC > Chapter 1 > Lesson 1.3.1 > Problem1-99

1-99.

Given $f\left(x\right) = x^{2} + 2x$, solve for $x$ where $f\left(x + 2\right) = 0$.

Substitute $\left(x + 2\right)$ for every $x$ in the $f\left(x\right)$ function.

Remember the middle term when you expand $\left(x + 2\right)^{2}$.