6x^2+13x-18=

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Solution for 6x^2+13x-18= equation:


Simplifying
6x2 + 13x + -18 = 0

Reorder the terms:
-18 + 13x + 6x2 = 0

Solving
-18 + 13x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-3 + 2.166666667x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 2.166666667x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 2.166666667x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 2.166666667x + x2 = 0 + 3
2.166666667x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
2.166666667x + x2 = 3

The x term is 2.166666667x.  Take half its coefficient (1.083333334).
Square it (1.173611113) and add it to both sides.

Add '1.173611113' to each side of the equation.
2.166666667x + 1.173611113 + x2 = 3 + 1.173611113

Reorder the terms:
1.173611113 + 2.166666667x + x2 = 3 + 1.173611113

Combine like terms: 3 + 1.173611113 = 4.173611113
1.173611113 + 2.166666667x + x2 = 4.173611113

Factor a perfect square on the left side:
(x + 1.083333334)(x + 1.083333334) = 4.173611113

Calculate the square root of the right side: 2.042941779

Break this problem into two subproblems by setting 
(x + 1.083333334) equal to 2.042941779 and -2.042941779.

Subproblem 1

x + 1.083333334 = 2.042941779 Simplifying x + 1.083333334 = 2.042941779 Reorder the terms: 1.083333334 + x = 2.042941779 Solving 1.083333334 + x = 2.042941779 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.083333334' to each side of the equation. 1.083333334 + -1.083333334 + x = 2.042941779 + -1.083333334 Combine like terms: 1.083333334 + -1.083333334 = 0.000000000 0.000000000 + x = 2.042941779 + -1.083333334 x = 2.042941779 + -1.083333334 Combine like terms: 2.042941779 + -1.083333334 = 0.959608445 x = 0.959608445 Simplifying x = 0.959608445

Subproblem 2

x + 1.083333334 = -2.042941779 Simplifying x + 1.083333334 = -2.042941779 Reorder the terms: 1.083333334 + x = -2.042941779 Solving 1.083333334 + x = -2.042941779 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.083333334' to each side of the equation. 1.083333334 + -1.083333334 + x = -2.042941779 + -1.083333334 Combine like terms: 1.083333334 + -1.083333334 = 0.000000000 0.000000000 + x = -2.042941779 + -1.083333334 x = -2.042941779 + -1.083333334 Combine like terms: -2.042941779 + -1.083333334 = -3.126275113 x = -3.126275113 Simplifying x = -3.126275113

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.959608445, -3.126275113}

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