3x^2-2x-6=24

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Solution for 3x^2-2x-6=24 equation:


Simplifying
3x2 + -2x + -6 = 24

Reorder the terms:
-6 + -2x + 3x2 = 24

Solving
-6 + -2x + 3x2 = 24

Solving for variable 'x'.

Reorder the terms:
-6 + -24 + -2x + 3x2 = 24 + -24

Combine like terms: -6 + -24 = -30
-30 + -2x + 3x2 = 24 + -24

Combine like terms: 24 + -24 = 0
-30 + -2x + 3x2 = 0

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
-10 + -0.6666666667x + x2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -0.6666666667x + 10 + x2 = 0 + 10

Reorder the terms:
-10 + 10 + -0.6666666667x + x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -0.6666666667x + x2 = 0 + 10
-0.6666666667x + x2 = 0 + 10

Combine like terms: 0 + 10 = 10
-0.6666666667x + x2 = 10

The x term is -0.6666666667x.  Take half its coefficient (-0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
-0.6666666667x + 0.1111111112 + x2 = 10 + 0.1111111112

Reorder the terms:
0.1111111112 + -0.6666666667x + x2 = 10 + 0.1111111112

Combine like terms: 10 + 0.1111111112 = 10.1111111112
0.1111111112 + -0.6666666667x + x2 = 10.1111111112

Factor a perfect square on the left side:
(x + -0.3333333334)(x + -0.3333333334) = 10.1111111112

Calculate the square root of the right side: 3.179797338

Break this problem into two subproblems by setting 
(x + -0.3333333334) equal to 3.179797338 and -3.179797338.

Subproblem 1

x + -0.3333333334 = 3.179797338 Simplifying x + -0.3333333334 = 3.179797338 Reorder the terms: -0.3333333334 + x = 3.179797338 Solving -0.3333333334 + x = 3.179797338 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = 3.179797338 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = 3.179797338 + 0.3333333334 x = 3.179797338 + 0.3333333334 Combine like terms: 3.179797338 + 0.3333333334 = 3.5131306714 x = 3.5131306714 Simplifying x = 3.5131306714

Subproblem 2

x + -0.3333333334 = -3.179797338 Simplifying x + -0.3333333334 = -3.179797338 Reorder the terms: -0.3333333334 + x = -3.179797338 Solving -0.3333333334 + x = -3.179797338 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = -3.179797338 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = -3.179797338 + 0.3333333334 x = -3.179797338 + 0.3333333334 Combine like terms: -3.179797338 + 0.3333333334 = -2.8464640046 x = -2.8464640046 Simplifying x = -2.8464640046

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.5131306714, -2.8464640046}

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