3x^2-14x-18=0

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Solution for 3x^2-14x-18=0 equation:


Simplifying
3x2 + -14x + -18 = 0

Reorder the terms:
-18 + -14x + 3x2 = 0

Solving
-18 + -14x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-6 + -4.666666667x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -4.666666667x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -4.666666667x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -4.666666667x + x2 = 0 + 6
-4.666666667x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-4.666666667x + x2 = 6

The x term is -4.666666667x.  Take half its coefficient (-2.333333334).
Square it (5.444444448) and add it to both sides.

Add '5.444444448' to each side of the equation.
-4.666666667x + 5.444444448 + x2 = 6 + 5.444444448

Reorder the terms:
5.444444448 + -4.666666667x + x2 = 6 + 5.444444448

Combine like terms: 6 + 5.444444448 = 11.444444448
5.444444448 + -4.666666667x + x2 = 11.444444448

Factor a perfect square on the left side:
(x + -2.333333334)(x + -2.333333334) = 11.444444448

Calculate the square root of the right side: 3.382963856

Break this problem into two subproblems by setting 
(x + -2.333333334) equal to 3.382963856 and -3.382963856.

Subproblem 1

x + -2.333333334 = 3.382963856 Simplifying x + -2.333333334 = 3.382963856 Reorder the terms: -2.333333334 + x = 3.382963856 Solving -2.333333334 + x = 3.382963856 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.333333334' to each side of the equation. -2.333333334 + 2.333333334 + x = 3.382963856 + 2.333333334 Combine like terms: -2.333333334 + 2.333333334 = 0.000000000 0.000000000 + x = 3.382963856 + 2.333333334 x = 3.382963856 + 2.333333334 Combine like terms: 3.382963856 + 2.333333334 = 5.71629719 x = 5.71629719 Simplifying x = 5.71629719

Subproblem 2

x + -2.333333334 = -3.382963856 Simplifying x + -2.333333334 = -3.382963856 Reorder the terms: -2.333333334 + x = -3.382963856 Solving -2.333333334 + x = -3.382963856 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.333333334' to each side of the equation. -2.333333334 + 2.333333334 + x = -3.382963856 + 2.333333334 Combine like terms: -2.333333334 + 2.333333334 = 0.000000000 0.000000000 + x = -3.382963856 + 2.333333334 x = -3.382963856 + 2.333333334 Combine like terms: -3.382963856 + 2.333333334 = -1.049630522 x = -1.049630522 Simplifying x = -1.049630522

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.71629719, -1.049630522}

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