2x^2-18=-9

Solution for 2x^2-18=-9 equation:

Simplifying
2x2 + -18 = -9

Reorder the terms:
-18 + 2x2 = -9

Solving
-18 + 2x2 = -9

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '18' to each side of the equation.
-18 + 18 + 2x2 = -9 + 18

Combine like terms: -18 + 18 = 0
0 + 2x2 = -9 + 18
2x2 = -9 + 18

Combine like terms: -9 + 18 = 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}