3.14159265*x^2-78.53982=225

Solution for 3.14159265*x^2-78.53982=225 equation:

Simplifying
3.14159265x2 + -78.53982 = 225

Reorder the terms:
-78.53982 + 3.14159265x2 = 225

Solving
-78.53982 + 3.14159265x2 = 225

Solving for variable 'x'.

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

Add '78.53982' to each side of the equation.
-78.53982 + 78.53982 + 3.14159265x2 = 225 + 78.53982

Combine like terms: -78.53982 + 78.53982 = 0.00000
0.00000 + 3.14159265x2 = 225 + 78.53982
3.14159265x2 = 225 + 78.53982

Combine like terms: 225 + 78.53982 = 303.53982
3.14159265x2 = 303.53982

Divide each side by '3.14159265'.
x2 = 96.61972567

Simplifying
x2 = 96.61972567

Take the square root of each side:
x = {-9.829533339, 9.829533339}