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Simplifying
315 = 4x2 + -9
Reorder the terms:
315 = -9 + 4x2
Solving
315 = -9 + 4x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-4x2' to each side of the equation.
315 + -4x2 = -9 + 4x2 + -4x2
Combine like terms: 4x2 + -4x2 = 0
315 + -4x2 = -9 + 0
315 + -4x2 = -9
Add '-315' to each side of the equation.
315 + -315 + -4x2 = -9 + -315
Combine like terms: 315 + -315 = 0
0 + -4x2 = -9 + -315
-4x2 = -9 + -315
Combine like terms: -9 + -315 = -324
-4x2 = -324
Divide each side by '-4'.
x2 = 81
Simplifying
x2 = 81
Take the square root of each side:
x = {-9, 9}
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