x=7x^2+8x-6

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Solution for x=7x^2+8x-6 equation:


Simplifying
x = 7x2 + 8x + -6

Reorder the terms:
x = -6 + 8x + 7x2

Solving
x = -6 + 8x + 7x2

Solving for variable 'x'.

Reorder the terms:
6 + x + -8x + -7x2 = -6 + 8x + 7x2 + 6 + -8x + -7x2

Combine like terms: x + -8x = -7x
6 + -7x + -7x2 = -6 + 8x + 7x2 + 6 + -8x + -7x2

Reorder the terms:
6 + -7x + -7x2 = -6 + 6 + 8x + -8x + 7x2 + -7x2

Combine like terms: -6 + 6 = 0
6 + -7x + -7x2 = 0 + 8x + -8x + 7x2 + -7x2
6 + -7x + -7x2 = 8x + -8x + 7x2 + -7x2

Combine like terms: 8x + -8x = 0
6 + -7x + -7x2 = 0 + 7x2 + -7x2
6 + -7x + -7x2 = 7x2 + -7x2

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

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

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

Move the constant term to the right:

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

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

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

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

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 0.8571428571 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 0.8571428571 + 0.25

Combine like terms: 0.8571428571 + 0.25 = 1.1071428571
1.25 + x2 = 1.1071428571

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 1.1071428571

Calculate the square root of the right side: 1.052208562

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.052208562 and -1.052208562.

Subproblem 1

x + 0.5 = 1.052208562 Simplifying x + 0.5 = 1.052208562 Reorder the terms: 0.5 + x = 1.052208562 Solving 0.5 + x = 1.052208562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 1.052208562 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.052208562 + -0.5 x = 1.052208562 + -0.5 Combine like terms: 1.052208562 + -0.5 = 0.552208562 x = 0.552208562 Simplifying x = 0.552208562

Subproblem 2

x + 0.5 = -1.052208562 Simplifying x + 0.5 = -1.052208562 Reorder the terms: 0.5 + x = -1.052208562 Solving 0.5 + x = -1.052208562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -1.052208562 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.052208562 + -0.5 x = -1.052208562 + -0.5 Combine like terms: -1.052208562 + -0.5 = -1.552208562 x = -1.552208562 Simplifying x = -1.552208562

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.552208562, -1.552208562}

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