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Simplifying
7x2 + -15 = -2
Reorder the terms:
-15 + 7x2 = -2
Solving
-15 + 7x2 = -2
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 + 7x2 = -2 + 15
Combine like terms: -15 + 15 = 0
0 + 7x2 = -2 + 15
7x2 = -2 + 15
Combine like terms: -2 + 15 = 13
7x2 = 13
Divide each side by '7'.
x2 = 1.857142857
Simplifying
x2 = 1.857142857
Take the square root of each side:
x = {-1.362770288, 1.362770288}
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