Question

if $r = -1$, what is $sqrt{19 + 18r}$?

Explanation:

Step1: Substitute r = -1 into expression

$\sqrt{19 + 18(-1)}$

Step2: Calculate inside the square root

$\sqrt{19 - 18} = \sqrt{1}$

Step3: Simplify the square root

$\sqrt{1} = 1$

Answer:

1