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Simplifying
2x2 + -15 = 8
Reorder the terms:
-15 + 2x2 = 8
Solving
-15 + 2x2 = 8
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '15' to each side of the equation.
-15 + 15 + 2x2 = 8 + 15
Combine like terms: -15 + 15 = 0
0 + 2x2 = 8 + 15
2x2 = 8 + 15
Combine like terms: 8 + 15 = 23
2x2 = 23
Divide each side by '2'.
x2 = 11.5
Simplifying
x2 = 11.5
Take the square root of each side:
x = {-3.391164992, 3.391164992}
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