2x^2-11-21=0

Solution for 2x^2-11-21=0 equation:

Simplifying
2x2 + -11 + -21 = 0

Reorder the terms:
-11 + -21 + 2x2 = 0

Combine like terms: -11 + -21 = -32
-32 + 2x2 = 0

Solving
-32 + 2x2 = 0

Solving for variable 'x'.

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

Add '32' to each side of the equation.
-32 + 32 + 2x2 = 0 + 32

Combine like terms: -32 + 32 = 0
0 + 2x2 = 0 + 32
2x2 = 0 + 32

Combine like terms: 0 + 32 = 32
2x2 = 32

Divide each side by '2'.
x2 = 16

Simplifying
x2 = 16

Take the square root of each side:
x = {-4, 4}