2x^2+3=18

Solution for 2x^2+3=18 equation:

Simplifying
2x2 + 3 = 18

Reorder the terms:
3 + 2x2 = 18

Solving
3 + 2x2 = 18

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + 2x2 = 18 + -3

Combine like terms: 3 + -3 = 0
0 + 2x2 = 18 + -3
2x2 = 18 + -3

Combine like terms: 18 + -3 = 15
2x2 = 15

Divide each side by '2'.
x2 = 7.5

Simplifying
x2 = 7.5

Take the square root of each side:
x = {-2.738612788, 2.738612788}