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Simplifying
2x2 + -40 = 9
Reorder the terms:
-40 + 2x2 = 9
Solving
-40 + 2x2 = 9
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '40' to each side of the equation.
-40 + 40 + 2x2 = 9 + 40
Combine like terms: -40 + 40 = 0
0 + 2x2 = 9 + 40
2x2 = 9 + 40
Combine like terms: 9 + 40 = 49
2x2 = 49
Divide each side by '2'.
x2 = 24.5
Simplifying
x2 = 24.5
Take the square root of each side:
x = {-4.949747468, 4.949747468}
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