0=3x^2-2x-21

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


Simplifying
0 = 3x2 + -2x + -21

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

Solving
0 = -21 + -2x + 3x2

Solving for variable 'x'.

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

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

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

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

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

Factor a trinomial.
(3 + -1x)(7 + 3x) = 0


Subproblem 1
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

Subproblem 2
Set the factor '(7 + 3x)' equal to zero and attempt to solve:

Simplifying
7 + 3x = 0

Solving
7 + 3x = 0

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

Add '-7' to each side of the equation.
7 + -7 + 3x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 3x = 0 + -7
3x = 0 + -7

Combine like terms: 0 + -7 = -7
3x = -7

Divide each side by '3'.
x = -2.333333333

Simplifying
x = -2.333333333
Solution
x = {3, -2.333333333}

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