Asked by princess

solve the equation by completing the square:
x^2-9x-2=0
Answered by Reiny
x^2-9x-2=0
x^2-9x + <b>81/4</b> = 2 + <b>81/4</b>
(x-9/2)^2 = 89/4
x-9/2 = ±√89/2
x = 9/2 ±√89/2
x = (9 ± √89)/2