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 = -10
-10 + 2x2 = 0

Solving
-10 + 2x2 = 0

Solving for variable 'x'.

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

Add '10' to each side of the equation.
-10 + 10 + 2x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 2x2 = 0 + 10
2x2 = 0 + 10

Combine like terms: 0 + 10 = 10
2x2 = 10

Divide each side by '2'.
x2 = 5

Simplifying
x2 = 5

Take the square root of each side:
x = {-2.236067978, 2.236067978}