Question

is $r = -3$ a solution to this equation?
$-2r - r^2 = -3$
yes no

Explanation:

Step1: Substitute $r=-3$ into equation

$$\begin{align*} -2(-3) - (-3)^2 &= -3 \end{align*}$$

Step2: Calculate left-hand side values

$$\begin{align*} 6 - 9 &= -3 \end{align*}$$

Step3: Simplify left-hand side

$-3 = -3$

Answer:

yes