13x^2+19x-3=0

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Solution for 13x^2+19x-3=0 equation:


Simplifying
13x2 + 19x + -3 = 0

Reorder the terms:
-3 + 19x + 13x2 = 0

Solving
-3 + 19x + 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'.
-0.2307692308 + 1.461538462x + x2 = 0

Move the constant term to the right:

Add '0.2307692308' to each side of the equation.
-0.2307692308 + 1.461538462x + 0.2307692308 + x2 = 0 + 0.2307692308

Reorder the terms:
-0.2307692308 + 0.2307692308 + 1.461538462x + x2 = 0 + 0.2307692308

Combine like terms: -0.2307692308 + 0.2307692308 = 0.0000000000
0.0000000000 + 1.461538462x + x2 = 0 + 0.2307692308
1.461538462x + x2 = 0 + 0.2307692308

Combine like terms: 0 + 0.2307692308 = 0.2307692308
1.461538462x + x2 = 0.2307692308

The x term is 1.461538462x.  Take half its coefficient (0.730769231).
Square it (0.5340236690) and add it to both sides.

Add '0.5340236690' to each side of the equation.
1.461538462x + 0.5340236690 + x2 = 0.2307692308 + 0.5340236690

Reorder the terms:
0.5340236690 + 1.461538462x + x2 = 0.2307692308 + 0.5340236690

Combine like terms: 0.2307692308 + 0.5340236690 = 0.7647928998
0.5340236690 + 1.461538462x + x2 = 0.7647928998

Factor a perfect square on the left side:
(x + 0.730769231)(x + 0.730769231) = 0.7647928998

Calculate the square root of the right side: 0.874524385

Break this problem into two subproblems by setting 
(x + 0.730769231) equal to 0.874524385 and -0.874524385.

Subproblem 1

x + 0.730769231 = 0.874524385 Simplifying x + 0.730769231 = 0.874524385 Reorder the terms: 0.730769231 + x = 0.874524385 Solving 0.730769231 + x = 0.874524385 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.730769231' to each side of the equation. 0.730769231 + -0.730769231 + x = 0.874524385 + -0.730769231 Combine like terms: 0.730769231 + -0.730769231 = 0.000000000 0.000000000 + x = 0.874524385 + -0.730769231 x = 0.874524385 + -0.730769231 Combine like terms: 0.874524385 + -0.730769231 = 0.143755154 x = 0.143755154 Simplifying x = 0.143755154

Subproblem 2

x + 0.730769231 = -0.874524385 Simplifying x + 0.730769231 = -0.874524385 Reorder the terms: 0.730769231 + x = -0.874524385 Solving 0.730769231 + x = -0.874524385 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.730769231' to each side of the equation. 0.730769231 + -0.730769231 + x = -0.874524385 + -0.730769231 Combine like terms: 0.730769231 + -0.730769231 = 0.000000000 0.000000000 + x = -0.874524385 + -0.730769231 x = -0.874524385 + -0.730769231 Combine like terms: -0.874524385 + -0.730769231 = -1.605293616 x = -1.605293616 Simplifying x = -1.605293616

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.143755154, -1.605293616}

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