7x^2+6x-5=0

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Solution for 7x^2+6x-5=0 equation:


Simplifying
7x2 + 6x + -5 = 0

Reorder the terms:
-5 + 6x + 7x2 = 0

Solving
-5 + 6x + 7x2 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
-0.7142857143 + 0.8571428571x + x2 = 0

Move the constant term to the right:

Add '0.7142857143' to each side of the equation.
-0.7142857143 + 0.8571428571x + 0.7142857143 + x2 = 0 + 0.7142857143

Reorder the terms:
-0.7142857143 + 0.7142857143 + 0.8571428571x + x2 = 0 + 0.7142857143

Combine like terms: -0.7142857143 + 0.7142857143 = 0.0000000000
0.0000000000 + 0.8571428571x + x2 = 0 + 0.7142857143
0.8571428571x + x2 = 0 + 0.7142857143

Combine like terms: 0 + 0.7142857143 = 0.7142857143
0.8571428571x + x2 = 0.7142857143

The x term is 0.8571428571x.  Take half its coefficient (0.4285714286).
Square it (0.1836734694) and add it to both sides.

Add '0.1836734694' to each side of the equation.
0.8571428571x + 0.1836734694 + x2 = 0.7142857143 + 0.1836734694

Reorder the terms:
0.1836734694 + 0.8571428571x + x2 = 0.7142857143 + 0.1836734694

Combine like terms: 0.7142857143 + 0.1836734694 = 0.8979591837
0.1836734694 + 0.8571428571x + x2 = 0.8979591837

Factor a perfect square on the left side:
(x + 0.4285714286)(x + 0.4285714286) = 0.8979591837

Calculate the square root of the right side: 0.947607083

Break this problem into two subproblems by setting 
(x + 0.4285714286) equal to 0.947607083 and -0.947607083.

Subproblem 1

x + 0.4285714286 = 0.947607083 Simplifying x + 0.4285714286 = 0.947607083 Reorder the terms: 0.4285714286 + x = 0.947607083 Solving 0.4285714286 + x = 0.947607083 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4285714286' to each side of the equation. 0.4285714286 + -0.4285714286 + x = 0.947607083 + -0.4285714286 Combine like terms: 0.4285714286 + -0.4285714286 = 0.0000000000 0.0000000000 + x = 0.947607083 + -0.4285714286 x = 0.947607083 + -0.4285714286 Combine like terms: 0.947607083 + -0.4285714286 = 0.5190356544 x = 0.5190356544 Simplifying x = 0.5190356544

Subproblem 2

x + 0.4285714286 = -0.947607083 Simplifying x + 0.4285714286 = -0.947607083 Reorder the terms: 0.4285714286 + x = -0.947607083 Solving 0.4285714286 + x = -0.947607083 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4285714286' to each side of the equation. 0.4285714286 + -0.4285714286 + x = -0.947607083 + -0.4285714286 Combine like terms: 0.4285714286 + -0.4285714286 = 0.0000000000 0.0000000000 + x = -0.947607083 + -0.4285714286 x = -0.947607083 + -0.4285714286 Combine like terms: -0.947607083 + -0.4285714286 = -1.3761785116 x = -1.3761785116 Simplifying x = -1.3761785116

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5190356544, -1.3761785116}

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