x(7x+1)=5

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Solution for x(7x+1)=5 equation:


Simplifying
x(7x + 1) = 5

Reorder the terms:
x(1 + 7x) = 5
(1 * x + 7x * x) = 5
(1x + 7x2) = 5

Solving
1x + 7x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + 1x + 7x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 1x + 7x2 = 0

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

Divide each side by '7'.
-0.7142857143 + 0.1428571429x + x2 = 0

Move the constant term to the right:

Add '0.7142857143' to each side of the equation.
-0.7142857143 + 0.1428571429x + 0.7142857143 + x2 = 0 + 0.7142857143

Reorder the terms:
-0.7142857143 + 0.7142857143 + 0.1428571429x + x2 = 0 + 0.7142857143

Combine like terms: -0.7142857143 + 0.7142857143 = 0.0000000000
0.0000000000 + 0.1428571429x + x2 = 0 + 0.7142857143
0.1428571429x + x2 = 0 + 0.7142857143

Combine like terms: 0 + 0.7142857143 = 0.7142857143
0.1428571429x + x2 = 0.7142857143

The x term is 0.1428571429x.  Take half its coefficient (0.07142857145).
Square it (0.005102040819) and add it to both sides.

Add '0.005102040819' to each side of the equation.
0.1428571429x + 0.005102040819 + x2 = 0.7142857143 + 0.005102040819

Reorder the terms:
0.005102040819 + 0.1428571429x + x2 = 0.7142857143 + 0.005102040819

Combine like terms: 0.7142857143 + 0.005102040819 = 0.719387755119
0.005102040819 + 0.1428571429x + x2 = 0.719387755119

Factor a perfect square on the left side:
(x + 0.07142857145)(x + 0.07142857145) = 0.719387755119

Calculate the square root of the right side: 0.848167292

Break this problem into two subproblems by setting 
(x + 0.07142857145) equal to 0.848167292 and -0.848167292.

Subproblem 1

x + 0.07142857145 = 0.848167292 Simplifying x + 0.07142857145 = 0.848167292 Reorder the terms: 0.07142857145 + x = 0.848167292 Solving 0.07142857145 + x = 0.848167292 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.07142857145' to each side of the equation. 0.07142857145 + -0.07142857145 + x = 0.848167292 + -0.07142857145 Combine like terms: 0.07142857145 + -0.07142857145 = 0.00000000000 0.00000000000 + x = 0.848167292 + -0.07142857145 x = 0.848167292 + -0.07142857145 Combine like terms: 0.848167292 + -0.07142857145 = 0.77673872055 x = 0.77673872055 Simplifying x = 0.77673872055

Subproblem 2

x + 0.07142857145 = -0.848167292 Simplifying x + 0.07142857145 = -0.848167292 Reorder the terms: 0.07142857145 + x = -0.848167292 Solving 0.07142857145 + x = -0.848167292 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.07142857145' to each side of the equation. 0.07142857145 + -0.07142857145 + x = -0.848167292 + -0.07142857145 Combine like terms: 0.07142857145 + -0.07142857145 = 0.00000000000 0.00000000000 + x = -0.848167292 + -0.07142857145 x = -0.848167292 + -0.07142857145 Combine like terms: -0.848167292 + -0.07142857145 = -0.91959586345 x = -0.91959586345 Simplifying x = -0.91959586345

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.77673872055, -0.91959586345}

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