Answer:
x=9
Step-by-step explanation:
First divide both sides by -5. Once you do this you should have a result of √x=3. from here, square both sides. This will give you an answer of 9
[tex]Domain:\ x\geq0\\\\-5\sqrt{x}=-15\qquad\text{divide both sides by (-5)}\\\\\sqrt{x}=3\qquad\text{square both sides}\\\\(\sqrt{x})^2=3^2\qquad\text{use}\ (\sqrt{a})^2=a\\\\x=9[/tex]
