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Simplifying
2x2 + -1 = 9
Reorder the terms:
-1 + 2x2 = 9
Solving
-1 + 2x2 = 9
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '1' to each side of the equation.
-1 + 1 + 2x2 = 9 + 1
Combine like terms: -1 + 1 = 0
0 + 2x2 = 9 + 1
2x2 = 9 + 1
Combine like terms: 9 + 1 = 10
2x2 = 10
Divide each side by '2'.
x2 = 5
Simplifying
x2 = 5
Take the square root of each side:
x = {-2.236067978, 2.236067978}
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