Question

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

Answer 1

Consider : y² = 25

⇒ y =
`√(25)`

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

⇒ y =
`\sf{√((5)^2) \ \text(or) \ √((-5)^2)}`

⇒ y = +5 or -5

So, The Answer is C