6x^2-12x-21=-3

Solution for 6x^2-12x-21=-3 equation:

Simplifying
6x2 + -12x + -21 = -3

Reorder the terms:
-21 + -12x + 6x2 = -3

Solving
-21 + -12x + 6x2 = -3

Solving for variable 'x'.

Reorder the terms:
-21 + 3 + -12x + 6x2 = -3 + 3

Combine like terms: -21 + 3 = -18
-18 + -12x + 6x2 = -3 + 3

Combine like terms: -3 + 3 = 0
-18 + -12x + 6x2 = 0

Factor out the Greatest Common Factor (GCF), '6'.
6(-3 + -2x + x2) = 0

Factor a trinomial.
6((-1 + -1x)(3 + -1x)) = 0

Ignore the factor 6.
Subproblem 1
Set the factor '(-1 + -1x)' equal to zero and attempt to solve:

Simplifying
-1 + -1x = 0

Solving
-1 + -1x = 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 + -1x = 0 + 1

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

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

Divide each side by '-1'.
x = -1

Simplifying
x = -1
Subproblem 2
Set the factor '(3 + -1x)' equal to zero and attempt to solve:

Simplifying
3 + -1x = 0

Solving
3 + -1x = 0

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

Add '-3' to each side of the equation.
3 + -3 + -1x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -1x = 0 + -3
-1x = 0 + -3

Combine like terms: 0 + -3 = -3
-1x = -3

Divide each side by '-1'.
x = 3

Simplifying
x = 3
Solution
x = {-1, 3}