Question

Solve x2 − 90 = 0. If necessary, round to the nearest hundredth.

8100
±9.49
There is no solution as you cannot take the square root of a negative number.
±180

Answer 1

Option B,
`x =` ±
`9.49`

Explanation:

Step 1: Add 90 to both sides

`x^2 - 90 = 0`

`x^2 - 90 + 90 = 0 + 90`

`x^2 = 90`

Step 2: Square root both sides

`√(x^2) = √(90)`

`x =` ±
`9.49`

Answer: Option B,
`x =` ±
`9.49`