Question

Find the exact Solution of x.

x^2 = 16

A)x = 4
B)x = -4
C)x = ±4
D)No Solution

Answer 1

x^2 = 16
x = √16
x = 4.
so the answer is A. x = 4.

Answer 2

`x^(2)` = 16

First, take the square root to both sides.

`x =` ±
`√(16)`
Second, now we have 4 × 4 which is 16, meaning the square root of 16 is 4.

`x =` ±
`4`
Third, there are two solutions.

`-4 \\ and \\ 4`
Fourth, since we have two values, it is reasonable to use the plus-minus sign to indicate there is a positive and a negative solution.

Answer: C) x = ±4