-x^2+16x-144=0

Solution for -x^2+16x-144=0 equation:

Simplifying
-1x2 + 16x + -144 = 0

Reorder the terms:
-144 + 16x + -1x2 = 0

Solving
-144 + 16x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
144 + -16x + x2 = 0

Move the constant term to the right:

Add '-144' to each side of the equation.
144 + -16x + -144 + x2 = 0 + -144

Reorder the terms:
144 + -144 + -16x + x2 = 0 + -144

Combine like terms: 144 + -144 = 0
0 + -16x + x2 = 0 + -144
-16x + x2 = 0 + -144

Combine like terms: 0 + -144 = -144
-16x + x2 = -144

The x term is -16x.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16x + 64 + x2 = -144 + 64

Reorder the terms:
64 + -16x + x2 = -144 + 64

Combine like terms: -144 + 64 = -80
64 + -16x + x2 = -80

Factor a perfect square on the left side:
(x + -8)(x + -8) = -80

Can't calculate square root of the right side.

The solution to this equation could not be determined.