Question

Solve for x

4-x^2=-16

Answer 1

x = ± 2
`√(5)`

Explanation:

To solve this, you need to get x by itself.

4 - x² = -16

-x² = -20

x² = 20

x = ±
`√(20)`

x = ± 2
`√(5)`

Answer 2

x=2√5 or x=−2√5

Explanation:

4−x2=−16

Step 1: Simplify both sides of the equation.

−x2+4=−16

Step 2: Subtract 4 from both sides.

−x2+4−4=−16−4

−x2=−20

Step 3: Divide both sides by -1.

−x2 −1

= −20 −1

x2=20

Step 4: Take square root.

x=±√20

x=2√5 or x=−2√5