3x^2-26x=-2x-7x-12

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Solution for 3x^2-26x=-2x-7x-12 equation:


Simplifying
3x2 + -26x = -2x + -7x + -12

Reorder the terms:
-26x + 3x2 = -2x + -7x + -12

Reorder the terms:
-26x + 3x2 = -12 + -2x + -7x

Combine like terms: -2x + -7x = -9x
-26x + 3x2 = -12 + -9x

Solving
-26x + 3x2 = -12 + -9x

Solving for variable 'x'.

Reorder the terms:
12 + -26x + 9x + 3x2 = -12 + -9x + 12 + 9x

Combine like terms: -26x + 9x = -17x
12 + -17x + 3x2 = -12 + -9x + 12 + 9x

Reorder the terms:
12 + -17x + 3x2 = -12 + 12 + -9x + 9x

Combine like terms: -12 + 12 = 0
12 + -17x + 3x2 = 0 + -9x + 9x
12 + -17x + 3x2 = -9x + 9x

Combine like terms: -9x + 9x = 0
12 + -17x + 3x2 = 0

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

Divide each side by '3'.
4 + -5.666666667x + x2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -5.666666667x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + -5.666666667x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -5.666666667x + x2 = 0 + -4
-5.666666667x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
-5.666666667x + x2 = -4

The x term is -5.666666667x.  Take half its coefficient (-2.833333334).
Square it (8.027777782) and add it to both sides.

Add '8.027777782' to each side of the equation.
-5.666666667x + 8.027777782 + x2 = -4 + 8.027777782

Reorder the terms:
8.027777782 + -5.666666667x + x2 = -4 + 8.027777782

Combine like terms: -4 + 8.027777782 = 4.027777782
8.027777782 + -5.666666667x + x2 = 4.027777782

Factor a perfect square on the left side:
(x + -2.833333334)(x + -2.833333334) = 4.027777782

Calculate the square root of the right side: 2.006932431

Break this problem into two subproblems by setting 
(x + -2.833333334) equal to 2.006932431 and -2.006932431.

Subproblem 1

x + -2.833333334 = 2.006932431 Simplifying x + -2.833333334 = 2.006932431 Reorder the terms: -2.833333334 + x = 2.006932431 Solving -2.833333334 + x = 2.006932431 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.833333334' to each side of the equation. -2.833333334 + 2.833333334 + x = 2.006932431 + 2.833333334 Combine like terms: -2.833333334 + 2.833333334 = 0.000000000 0.000000000 + x = 2.006932431 + 2.833333334 x = 2.006932431 + 2.833333334 Combine like terms: 2.006932431 + 2.833333334 = 4.840265765 x = 4.840265765 Simplifying x = 4.840265765

Subproblem 2

x + -2.833333334 = -2.006932431 Simplifying x + -2.833333334 = -2.006932431 Reorder the terms: -2.833333334 + x = -2.006932431 Solving -2.833333334 + x = -2.006932431 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.833333334' to each side of the equation. -2.833333334 + 2.833333334 + x = -2.006932431 + 2.833333334 Combine like terms: -2.833333334 + 2.833333334 = 0.000000000 0.000000000 + x = -2.006932431 + 2.833333334 x = -2.006932431 + 2.833333334 Combine like terms: -2.006932431 + 2.833333334 = 0.826400903 x = 0.826400903 Simplifying x = 0.826400903

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.840265765, 0.826400903}

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