13x^2-3x-18=

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Solution for 13x^2-3x-18= equation:


Simplifying
13x2 + -3x + -18 = 0

Reorder the terms:
-18 + -3x + 13x2 = 0

Solving
-18 + -3x + 13x2 = 0

Solving for variable 'x'.

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

Divide each side by '13'.
-1.384615385 + -0.2307692308x + x2 = 0

Move the constant term to the right:

Add '1.384615385' to each side of the equation.
-1.384615385 + -0.2307692308x + 1.384615385 + x2 = 0 + 1.384615385

Reorder the terms:
-1.384615385 + 1.384615385 + -0.2307692308x + x2 = 0 + 1.384615385

Combine like terms: -1.384615385 + 1.384615385 = 0.000000000
0.000000000 + -0.2307692308x + x2 = 0 + 1.384615385
-0.2307692308x + x2 = 0 + 1.384615385

Combine like terms: 0 + 1.384615385 = 1.384615385
-0.2307692308x + x2 = 1.384615385

The x term is -0.2307692308x.  Take half its coefficient (-0.1153846154).
Square it (0.01331360947) and add it to both sides.

Add '0.01331360947' to each side of the equation.
-0.2307692308x + 0.01331360947 + x2 = 1.384615385 + 0.01331360947

Reorder the terms:
0.01331360947 + -0.2307692308x + x2 = 1.384615385 + 0.01331360947

Combine like terms: 1.384615385 + 0.01331360947 = 1.39792899447
0.01331360947 + -0.2307692308x + x2 = 1.39792899447

Factor a perfect square on the left side:
(x + -0.1153846154)(x + -0.1153846154) = 1.39792899447

Calculate the square root of the right side: 1.182340473

Break this problem into two subproblems by setting 
(x + -0.1153846154) equal to 1.182340473 and -1.182340473.

Subproblem 1

x + -0.1153846154 = 1.182340473 Simplifying x + -0.1153846154 = 1.182340473 Reorder the terms: -0.1153846154 + x = 1.182340473 Solving -0.1153846154 + x = 1.182340473 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1153846154' to each side of the equation. -0.1153846154 + 0.1153846154 + x = 1.182340473 + 0.1153846154 Combine like terms: -0.1153846154 + 0.1153846154 = 0.0000000000 0.0000000000 + x = 1.182340473 + 0.1153846154 x = 1.182340473 + 0.1153846154 Combine like terms: 1.182340473 + 0.1153846154 = 1.2977250884 x = 1.2977250884 Simplifying x = 1.2977250884

Subproblem 2

x + -0.1153846154 = -1.182340473 Simplifying x + -0.1153846154 = -1.182340473 Reorder the terms: -0.1153846154 + x = -1.182340473 Solving -0.1153846154 + x = -1.182340473 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1153846154' to each side of the equation. -0.1153846154 + 0.1153846154 + x = -1.182340473 + 0.1153846154 Combine like terms: -0.1153846154 + 0.1153846154 = 0.0000000000 0.0000000000 + x = -1.182340473 + 0.1153846154 x = -1.182340473 + 0.1153846154 Combine like terms: -1.182340473 + 0.1153846154 = -1.0669558576 x = -1.0669558576 Simplifying x = -1.0669558576

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2977250884, -1.0669558576}

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