5x^2+36-81=0

Solution for 5x^2+36-81=0 equation:

Simplifying
5x2 + 36 + -81 = 0

Reorder the terms:
36 + -81 + 5x2 = 0

Combine like terms: 36 + -81 = -45
-45 + 5x2 = 0

Solving
-45 + 5x2 = 0

Solving for variable 'x'.

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

Add '45' to each side of the equation.
-45 + 45 + 5x2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + 5x2 = 0 + 45
5x2 = 0 + 45

Combine like terms: 0 + 45 = 45
5x2 = 45

Divide each side by '5'.
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}