Question

Solve x2 − 20 = 0. If necessary, round to the nearest hundredth.

±4.47
400
±40
There is no solution as you cannot take the square root of a negative number.

Answer 1

Option A,
`x =` ±
`4.47`

Explanation:

Step 1: Add 20 to both sides

`x^2 - 20 = 0`

`x^2 - 20 + 20 = 0 + 20`

`x^2 = 20`

Step 2: Square root both sides

`√(x^2) = √(20)`

`x =` ±
`4.47`

Answer: Option A,
`x =` ±
`4.47`