7x^2+13x=6

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Solution for 7x^2+13x=6 equation:


Simplifying
7x2 + 13x = 6

Reorder the terms:
13x + 7x2 = 6

Solving
13x + 7x2 = 6

Solving for variable 'x'.

Reorder the terms:
-6 + 13x + 7x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-6 + 13x + 7x2 = 0

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

Divide each side by '7'.
-0.8571428571 + 1.857142857x + x2 = 0

Move the constant term to the right:

Add '0.8571428571' to each side of the equation.
-0.8571428571 + 1.857142857x + 0.8571428571 + x2 = 0 + 0.8571428571

Reorder the terms:
-0.8571428571 + 0.8571428571 + 1.857142857x + x2 = 0 + 0.8571428571

Combine like terms: -0.8571428571 + 0.8571428571 = 0.0000000000
0.0000000000 + 1.857142857x + x2 = 0 + 0.8571428571
1.857142857x + x2 = 0 + 0.8571428571

Combine like terms: 0 + 0.8571428571 = 0.8571428571
1.857142857x + x2 = 0.8571428571

The x term is 1.857142857x.  Take half its coefficient (0.9285714285).
Square it (0.8622448978) and add it to both sides.

Add '0.8622448978' to each side of the equation.
1.857142857x + 0.8622448978 + x2 = 0.8571428571 + 0.8622448978

Reorder the terms:
0.8622448978 + 1.857142857x + x2 = 0.8571428571 + 0.8622448978

Combine like terms: 0.8571428571 + 0.8622448978 = 1.7193877549
0.8622448978 + 1.857142857x + x2 = 1.7193877549

Factor a perfect square on the left side:
(x + 0.9285714285)(x + 0.9285714285) = 1.7193877549

Calculate the square root of the right side: 1.311254268

Break this problem into two subproblems by setting 
(x + 0.9285714285) equal to 1.311254268 and -1.311254268.

Subproblem 1

x + 0.9285714285 = 1.311254268 Simplifying x + 0.9285714285 = 1.311254268 Reorder the terms: 0.9285714285 + x = 1.311254268 Solving 0.9285714285 + x = 1.311254268 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9285714285' to each side of the equation. 0.9285714285 + -0.9285714285 + x = 1.311254268 + -0.9285714285 Combine like terms: 0.9285714285 + -0.9285714285 = 0.0000000000 0.0000000000 + x = 1.311254268 + -0.9285714285 x = 1.311254268 + -0.9285714285 Combine like terms: 1.311254268 + -0.9285714285 = 0.3826828395 x = 0.3826828395 Simplifying x = 0.3826828395

Subproblem 2

x + 0.9285714285 = -1.311254268 Simplifying x + 0.9285714285 = -1.311254268 Reorder the terms: 0.9285714285 + x = -1.311254268 Solving 0.9285714285 + x = -1.311254268 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9285714285' to each side of the equation. 0.9285714285 + -0.9285714285 + x = -1.311254268 + -0.9285714285 Combine like terms: 0.9285714285 + -0.9285714285 = 0.0000000000 0.0000000000 + x = -1.311254268 + -0.9285714285 x = -1.311254268 + -0.9285714285 Combine like terms: -1.311254268 + -0.9285714285 = -2.2398256965 x = -2.2398256965 Simplifying x = -2.2398256965

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.3826828395, -2.2398256965}

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