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Simplifying
0 = 2x2 + -40
Reorder the terms:
0 = -40 + 2x2
Solving
0 = -40 + 2x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-2x2' to each side of the equation.
0 + -2x2 = -40 + 2x2 + -2x2
Remove the zero:
-2x2 = -40 + 2x2 + -2x2
Combine like terms: 2x2 + -2x2 = 0
-2x2 = -40 + 0
-2x2 = -40
Divide each side by '-2'.
x2 = 20
Simplifying
x2 = 20
Take the square root of each side:
x = {-4.472135955, 4.472135955}
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