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Simplifying
2x2 + -1 = 8
Reorder the terms:
-1 + 2x2 = 8
Solving
-1 + 2x2 = 8
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 = 8 + 1
Combine like terms: -1 + 1 = 0
0 + 2x2 = 8 + 1
2x2 = 8 + 1
Combine like terms: 8 + 1 = 9
2x2 = 9
Divide each side by '2'.
x2 = 4.5
Simplifying
x2 = 4.5
Take the square root of each side:
x = {-2.121320344, 2.121320344}
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