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

Answer:

Option A, $x =$ ± $4.47$

Step-by-step 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

$\sqrt{x^2} = \sqrt{20}$

$x =$ ± $4.47$

Answer:  Option A, $x =$ ± $4.47$