0=X2-20

Rewrite the equation as X2-20=0.

X2-20=0

Add 20 to both sides of the equation.

X2=20

Take the square root of both sides of the equation to eliminate the exponent on the left side.

X=±20

Simplify the right side of the equation.

Rewrite 20 as 22⋅5.

Factor 4 out of 20.

X=±4(5)

Rewrite 4 as 22.

X=±22⋅5

X=±22⋅5

Pull terms out from under the radical.

X=±25

X=±25

The complete solution is the result of both the positive and negative portions of the solution.

First, use the positive value of the ± to find the first solution.

X=25

Next, use the negative value of the ± to find the second solution.

X=-25

The complete solution is the result of both the positive and negative portions of the solution.

X=25,-25

X=25,-25

X=25,-25

The result can be shown in multiple forms.

Exact Form:

X=25,-25

Decimal Form:

X=4.47213595…,-4.47213595…

Solve using the Square Root Property 0=X^2-20