8x^2-91=-16x-6

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Solution for 8x^2-91=-16x-6 equation:


Simplifying
8x2 + -91 = -16x + -6

Reorder the terms:
-91 + 8x2 = -16x + -6

Reorder the terms:
-91 + 8x2 = -6 + -16x

Solving
-91 + 8x2 = -6 + -16x

Solving for variable 'x'.

Reorder the terms:
-91 + 6 + 16x + 8x2 = -6 + -16x + 6 + 16x

Combine like terms: -91 + 6 = -85
-85 + 16x + 8x2 = -6 + -16x + 6 + 16x

Reorder the terms:
-85 + 16x + 8x2 = -6 + 6 + -16x + 16x

Combine like terms: -6 + 6 = 0
-85 + 16x + 8x2 = 0 + -16x + 16x
-85 + 16x + 8x2 = -16x + 16x

Combine like terms: -16x + 16x = 0
-85 + 16x + 8x2 = 0

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

Divide each side by '8'.
-10.625 + 2x + x2 = 0

Move the constant term to the right:

Add '10.625' to each side of the equation.
-10.625 + 2x + 10.625 + x2 = 0 + 10.625

Reorder the terms:
-10.625 + 10.625 + 2x + x2 = 0 + 10.625

Combine like terms: -10.625 + 10.625 = 0.000
0.000 + 2x + x2 = 0 + 10.625
2x + x2 = 0 + 10.625

Combine like terms: 0 + 10.625 = 10.625
2x + x2 = 10.625

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 = 10.625 + 1

Reorder the terms:
1 + 2x + x2 = 10.625 + 1

Combine like terms: 10.625 + 1 = 11.625
1 + 2x + x2 = 11.625

Factor a perfect square on the left side:
(x + 1)(x + 1) = 11.625

Calculate the square root of the right side: 3.409545424

Break this problem into two subproblems by setting 
(x + 1) equal to 3.409545424 and -3.409545424.

Subproblem 1

x + 1 = 3.409545424 Simplifying x + 1 = 3.409545424 Reorder the terms: 1 + x = 3.409545424 Solving 1 + x = 3.409545424 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 = 3.409545424 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.409545424 + -1 x = 3.409545424 + -1 Combine like terms: 3.409545424 + -1 = 2.409545424 x = 2.409545424 Simplifying x = 2.409545424

Subproblem 2

x + 1 = -3.409545424 Simplifying x + 1 = -3.409545424 Reorder the terms: 1 + x = -3.409545424 Solving 1 + x = -3.409545424 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 = -3.409545424 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.409545424 + -1 x = -3.409545424 + -1 Combine like terms: -3.409545424 + -1 = -4.409545424 x = -4.409545424 Simplifying x = -4.409545424

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.409545424, -4.409545424}

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