0=7x^2+14x-6

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Solution for 0=7x^2+14x-6 equation:


Simplifying
0 = 7x2 + 14x + -6

Reorder the terms:
0 = -6 + 14x + 7x2

Solving
0 = -6 + 14x + 7x2

Solving for variable 'x'.

Combine like terms: 0 + 6 = 6
6 + -14x + -7x2 = -6 + 14x + 7x2 + 6 + -14x + -7x2

Reorder the terms:
6 + -14x + -7x2 = -6 + 6 + 14x + -14x + 7x2 + -7x2

Combine like terms: -6 + 6 = 0
6 + -14x + -7x2 = 0 + 14x + -14x + 7x2 + -7x2
6 + -14x + -7x2 = 14x + -14x + 7x2 + -7x2

Combine like terms: 14x + -14x = 0
6 + -14x + -7x2 = 0 + 7x2 + -7x2
6 + -14x + -7x2 = 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
6 + -14x + -7x2 = 0

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

Divide each side by '-7'.
-0.8571428571 + 2x + x2 = 0

Move the constant term to the right:

Add '0.8571428571' to each side of the equation.
-0.8571428571 + 2x + 0.8571428571 + x2 = 0 + 0.8571428571

Reorder the terms:
-0.8571428571 + 0.8571428571 + 2x + x2 = 0 + 0.8571428571

Combine like terms: -0.8571428571 + 0.8571428571 = 0.0000000000
0.0000000000 + 2x + x2 = 0 + 0.8571428571
2x + x2 = 0 + 0.8571428571

Combine like terms: 0 + 0.8571428571 = 0.8571428571
2x + x2 = 0.8571428571

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 0.8571428571 + 1

Reorder the terms:
1 + 2x + x2 = 0.8571428571 + 1

Combine like terms: 0.8571428571 + 1 = 1.8571428571
1 + 2x + x2 = 1.8571428571

Factor a perfect square on the left side:
(x + 1)(x + 1) = 1.8571428571

Calculate the square root of the right side: 1.362770288

Break this problem into two subproblems by setting 
(x + 1) equal to 1.362770288 and -1.362770288.

Subproblem 1

x + 1 = 1.362770288 Simplifying x + 1 = 1.362770288 Reorder the terms: 1 + x = 1.362770288 Solving 1 + x = 1.362770288 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1.362770288 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.362770288 + -1 x = 1.362770288 + -1 Combine like terms: 1.362770288 + -1 = 0.362770288 x = 0.362770288 Simplifying x = 0.362770288

Subproblem 2

x + 1 = -1.362770288 Simplifying x + 1 = -1.362770288 Reorder the terms: 1 + x = -1.362770288 Solving 1 + x = -1.362770288 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1.362770288 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.362770288 + -1 x = -1.362770288 + -1 Combine like terms: -1.362770288 + -1 = -2.362770288 x = -2.362770288 Simplifying x = -2.362770288

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.362770288, -2.362770288}

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