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
