13x^2+10x-1=0

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Solution for 13x^2+10x-1=0 equation:


Simplifying
13x2 + 10x + -1 = 0

Reorder the terms:
-1 + 10x + 13x2 = 0

Solving
-1 + 10x + 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'.
-0.07692307692 + 0.7692307692x + x2 = 0

Move the constant term to the right:

Add '0.07692307692' to each side of the equation.
-0.07692307692 + 0.7692307692x + 0.07692307692 + x2 = 0 + 0.07692307692

Reorder the terms:
-0.07692307692 + 0.07692307692 + 0.7692307692x + x2 = 0 + 0.07692307692

Combine like terms: -0.07692307692 + 0.07692307692 = 0.00000000000
0.00000000000 + 0.7692307692x + x2 = 0 + 0.07692307692
0.7692307692x + x2 = 0 + 0.07692307692

Combine like terms: 0 + 0.07692307692 = 0.07692307692
0.7692307692x + x2 = 0.07692307692

The x term is 0.7692307692x.  Take half its coefficient (0.3846153846).
Square it (0.1479289941) and add it to both sides.

Add '0.1479289941' to each side of the equation.
0.7692307692x + 0.1479289941 + x2 = 0.07692307692 + 0.1479289941

Reorder the terms:
0.1479289941 + 0.7692307692x + x2 = 0.07692307692 + 0.1479289941

Combine like terms: 0.07692307692 + 0.1479289941 = 0.22485207102
0.1479289941 + 0.7692307692x + x2 = 0.22485207102

Factor a perfect square on the left side:
(x + 0.3846153846)(x + 0.3846153846) = 0.22485207102

Calculate the square root of the right side: 0.474185693

Break this problem into two subproblems by setting 
(x + 0.3846153846) equal to 0.474185693 and -0.474185693.

Subproblem 1

x + 0.3846153846 = 0.474185693 Simplifying x + 0.3846153846 = 0.474185693 Reorder the terms: 0.3846153846 + x = 0.474185693 Solving 0.3846153846 + x = 0.474185693 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3846153846' to each side of the equation. 0.3846153846 + -0.3846153846 + x = 0.474185693 + -0.3846153846 Combine like terms: 0.3846153846 + -0.3846153846 = 0.0000000000 0.0000000000 + x = 0.474185693 + -0.3846153846 x = 0.474185693 + -0.3846153846 Combine like terms: 0.474185693 + -0.3846153846 = 0.0895703084 x = 0.0895703084 Simplifying x = 0.0895703084

Subproblem 2

x + 0.3846153846 = -0.474185693 Simplifying x + 0.3846153846 = -0.474185693 Reorder the terms: 0.3846153846 + x = -0.474185693 Solving 0.3846153846 + x = -0.474185693 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3846153846' to each side of the equation. 0.3846153846 + -0.3846153846 + x = -0.474185693 + -0.3846153846 Combine like terms: 0.3846153846 + -0.3846153846 = 0.0000000000 0.0000000000 + x = -0.474185693 + -0.3846153846 x = -0.474185693 + -0.3846153846 Combine like terms: -0.474185693 + -0.3846153846 = -0.8588010776 x = -0.8588010776 Simplifying x = -0.8588010776

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.0895703084, -0.8588010776}

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