Answer:
x = ± 2[tex]\sqrt{5}[/tex]
Step-by-step explanation:
To solve this, you need to get x by itself.
4 - x² = -16
-x² = -20
x² = 20
x = ± [tex]\sqrt{20}[/tex]
x=2√5 or x=−2√5
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
