2x^2+-3-21=0

Solution for 2x^2+-3-21=0 equation:

Simplifying
2x2 + -3 + -21 = 0

Reorder the terms:
-3 + -21 + 2x2 = 0

Combine like terms: -3 + -21 = -24
-24 + 2x2 = 0

Solving
-24 + 2x2 = 0

Solving for variable 'x'.

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

Add '24' to each side of the equation.
-24 + 24 + 2x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 2x2 = 0 + 24
2x2 = 0 + 24

Combine like terms: 0 + 24 = 24
2x2 = 24

Divide each side by '2'.
x2 = 12

Simplifying
x2 = 12

Take the square root of each side:
x = {-3.464101615, 3.464101615}