3x^2+25-81=0

Solution for 3x^2+25-81=0 equation:

Simplifying
3x2 + 25 + -81 = 0

Reorder the terms:
25 + -81 + 3x2 = 0

Combine like terms: 25 + -81 = -56
-56 + 3x2 = 0

Solving
-56 + 3x2 = 0

Solving for variable 'x'.

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

Add '56' to each side of the equation.
-56 + 56 + 3x2 = 0 + 56

Combine like terms: -56 + 56 = 0
0 + 3x2 = 0 + 56
3x2 = 0 + 56

Combine like terms: 0 + 56 = 56
3x2 = 56

Divide each side by '3'.
x2 = 18.66666667

Simplifying
x2 = 18.66666667

Take the square root of each side:
x = {-4.320493799, 4.320493799}