Question

True or False: If a^2 = 225, then a = √15.

Answer 1

False

Explanation:

given

a² = 225 ( take square root of both sides )

`√(a^2)` = ±
`√(225)` , then

a = ± 15 ( not
`√(15)` )

a = - 15 or a = 15

since - 15 × - 15 = 225 and 15 × 15 = 225