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Simplifying
40 = 2x2 + 4
Reorder the terms:
40 = 4 + 2x2
Solving
40 = 4 + 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.
40 + -2x2 = 4 + 2x2 + -2x2
Combine like terms: 2x2 + -2x2 = 0
40 + -2x2 = 4 + 0
40 + -2x2 = 4
Add '-40' to each side of the equation.
40 + -40 + -2x2 = 4 + -40
Combine like terms: 40 + -40 = 0
0 + -2x2 = 4 + -40
-2x2 = 4 + -40
Combine like terms: 4 + -40 = -36
-2x2 = -36
Divide each side by '-2'.
x2 = 18
Simplifying
x2 = 18
Take the square root of each side:
x = {-4.242640687, 4.242640687}
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