0=x^2-17-72

Solution for 0=x^2-17-72 equation:

Simplifying
0 = x2 + -17 + -72

Reorder the terms:
0 = -17 + -72 + x2

Combine like terms: -17 + -72 = -89
0 = -89 + x2

Solving
0 = -89 + x2

Solving for variable 'x'.

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

Add '-1x2' to each side of the equation.
0 + -1x2 = -89 + x2 + -1x2
Remove the zero:
-1x2 = -89 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-1x2 = -89 + 0
-1x2 = -89

Divide each side by '-1'.
x2 = 89

Simplifying
x2 = 89

Take the square root of each side:
x = {-9.433981132, 9.433981132}