Question

Which equation has both 5 and -5 as possible values of y?

Answer 1

Consider : y² = 25

⇒ y = $\sqrt{25}$

We know that : 5² = 25 and also (-5)² = 25

⇒ y = $\sf{\sqrt{(5)^2} \ \text(or) \ \sqrt{(-5)^2}}$

⇒ y = +5 or -5

So, The Answer is C