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Simplifying
2x2 + 21 + -198 = 0
Reorder the terms:
21 + -198 + 2x2 = 0
Combine like terms: 21 + -198 = -177
-177 + 2x2 = 0
Solving
-177 + 2x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '177' to each side of the equation.
-177 + 177 + 2x2 = 0 + 177
Combine like terms: -177 + 177 = 0
0 + 2x2 = 0 + 177
2x2 = 0 + 177
Combine like terms: 0 + 177 = 177
2x2 = 177
Divide each side by '2'.
x2 = 88.5
Simplifying
x2 = 88.5
Take the square root of each side:
x = {-9.407443861, 9.407443861}
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