### Home > A2C > Chapter 11 > Lesson 11.3.4 > Problem11-171

11-171.

If $f \left(x\right) = x^{2} + 7x$, calculate the values described below.

For parts (a)-(d), substitute the value for x and simplify.

1. $f \left(2\right)$

1. $f \left(−3\right)$

1. $f \left(i\right)$

1. $f \left(−3.5 + 1.5i\right)$

$x = −14.5$

1. Solve $f \left(x\right) = 0$

Factor $x^{2} + 7x = 0$.

$x = 0 \text{ and } x = −7$