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Simplifying
5x2 + 7 + -87 = 0
Reorder the terms:
7 + -87 + 5x2 = 0
Combine like terms: 7 + -87 = -80
-80 + 5x2 = 0
Solving
-80 + 5x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '80' to each side of the equation.
-80 + 80 + 5x2 = 0 + 80
Combine like terms: -80 + 80 = 0
0 + 5x2 = 0 + 80
5x2 = 0 + 80
Combine like terms: 0 + 80 = 80
5x2 = 80
Divide each side by '5'.
x2 = 16
Simplifying
x2 = 16
Take the square root of each side:
x = {-4, 4}
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