Solve the equation using square roots. x² + 20 = 4

Solution:

The given equation is :

x² + 20 = 4

It can be rewritten as

x² = 4 - 20

x² = -16

x = ± √-16

= ±4√-1

= ±4i where i = √-1

Another example could be : Solve x² + 29 = 4 for x.

x² + 29 = 4

x² + 25 = 0

x² + 25 = 0

x² = -25

x = ±5i

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Solve the equation using square roots. x² + 20 = 4

Summary:

Solving the equation using square roots. x² + 20 = 4 we obtain x = ±4i