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Simplifying
-7x2 + 8 = -13
Reorder the terms:
8 + -7x2 = -13
Solving
8 + -7x2 = -13
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-8' to each side of the equation.
8 + -8 + -7x2 = -13 + -8
Combine like terms: 8 + -8 = 0
0 + -7x2 = -13 + -8
-7x2 = -13 + -8
Combine like terms: -13 + -8 = -21
-7x2 = -21
Divide each side by '-7'.
x2 = 3
Simplifying
x2 = 3
Take the square root of each side:
x = {-1.732050808, 1.732050808}
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