X^2-9x+9x-81=0

Solution for X^2-9x+9x-81=0 equation:

Simplifying
X2 + -9x + 9x + -81 = 0

Reorder the terms:
-81 + X2 + -9x + 9x = 0

Combine like terms: -9x + 9x = 0
-81 + X2 + 0 = 0
-81 + X2 = 0

Solving
-81 + X2 = 0

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Add '81' to each side of the equation.
-81 + 81 + X2 = 0 + 81

Combine like terms: -81 + 81 = 0
0 + X2 = 0 + 81
X2 = 0 + 81

Combine like terms: 0 + 81 = 81
X2 = 81

Simplifying
X2 = 81

Take the square root of each side:
X = {-9, 9}