x^2-18x+81=-64

Solution for x^2-18x+81=-64 equation:

Simplifying
x2 + -18x + 81 = -64

Reorder the terms:
81 + -18x + x2 = -64

Solving
81 + -18x + x2 = -64

Solving for variable 'x'.

Reorder the terms:
81 + 64 + -18x + x2 = -64 + 64

Combine like terms: 81 + 64 = 145
145 + -18x + x2 = -64 + 64

Combine like terms: -64 + 64 = 0
145 + -18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-145' to each side of the equation.
145 + -18x + -145 + x2 = 0 + -145

Reorder the terms:
145 + -145 + -18x + x2 = 0 + -145

Combine like terms: 145 + -145 = 0
0 + -18x + x2 = 0 + -145
-18x + x2 = 0 + -145

Combine like terms: 0 + -145 = -145
-18x + x2 = -145

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = -145 + 81

Reorder the terms:
81 + -18x + x2 = -145 + 81

Combine like terms: -145 + 81 = -64
81 + -18x + x2 = -64

Factor a perfect square on the left side:
(x + -9)(x + -9) = -64

Can't calculate square root of the right side.

The solution to this equation could not be determined.