which equation has both 5 and -5 as possible values of y?
Consider : y² = 25
⇒ y = [tex]\sqrt{25}[/tex]
We know that : 5² = 25 and also (-5)² = 25
⇒ y = [tex]\sf{\sqrt{(5)^2} \ \text(or) \ \sqrt{(-5)^2}}[/tex]
⇒ y = +5 or -5
So, The Answer is C