Answer: X=5 or X=-1
Explanation:
Use the method complete the square.
1. Subtract 4 from both sides.
X^2-4x+4-4=9-4
Find what value added to both sides of the equation will make the equation on the left a perfect square trinomial.
(B/2)^2
-4/2=-2 (-2)^2 = 4
2.Add 4 to both sides.
X^2-4x + 4= 5+4
3.Factor
(x-2)^2=9
Solve for X
x-2= +or- 3
x=5 or x=-1