x^2+x+21=21

Solution for x^2+x+21=21 equation:

Simplifying
x2 + x + 21 = 21

Reorder the terms:
21 + x + x2 = 21

Add '-21' to each side of the equation.
21 + x + -21 + x2 = 21 + -21

Reorder the terms:
21 + -21 + x + x2 = 21 + -21

Combine like terms: 21 + -21 = 0
0 + x + x2 = 21 + -21
x + x2 = 21 + -21

Combine like terms: 21 + -21 = 0
x + x2 = 0

Solving
x + x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), 'x'.
x(1 + x) = 0

Subproblem 1
Set the factor 'x' equal to zero and attempt to solve:

Simplifying
x = 0

Solving
x = 0

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

Simplifying
x = 0
Subproblem 2
Set the factor '(1 + x)' equal to zero and attempt to solve:

Simplifying
1 + x = 0

Solving
1 + x = 0

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

Add '-1' to each side of the equation.
1 + -1 + x = 0 + -1

Combine like terms: 1 + -1 = 0
0 + x = 0 + -1
x = 0 + -1

Combine like terms: 0 + -1 = -1
x = -1

Simplifying
x = -1
Solution
x = {0, -1}