-8x(x-7)-6=5

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Solution for -8x(x-7)-6=5 equation:


Simplifying
-8x(x + -7) + -6 = 5

Reorder the terms:
-8x(-7 + x) + -6 = 5
(-7 * -8x + x * -8x) + -6 = 5
(56x + -8x2) + -6 = 5

Reorder the terms:
-6 + 56x + -8x2 = 5

Solving
-6 + 56x + -8x2 = 5

Solving for variable 'x'.

Reorder the terms:
-6 + -5 + 56x + -8x2 = 5 + -5

Combine like terms: -6 + -5 = -11
-11 + 56x + -8x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-11 + 56x + -8x2 = 0

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

Divide each side by '-8'.
1.375 + -7x + x2 = 0

Move the constant term to the right:

Add '-1.375' to each side of the equation.
1.375 + -7x + -1.375 + x2 = 0 + -1.375

Reorder the terms:
1.375 + -1.375 + -7x + x2 = 0 + -1.375

Combine like terms: 1.375 + -1.375 = 0.000
0.000 + -7x + x2 = 0 + -1.375
-7x + x2 = 0 + -1.375

Combine like terms: 0 + -1.375 = -1.375
-7x + x2 = -1.375

The x term is -7x.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7x + 12.25 + x2 = -1.375 + 12.25

Reorder the terms:
12.25 + -7x + x2 = -1.375 + 12.25

Combine like terms: -1.375 + 12.25 = 10.875
12.25 + -7x + x2 = 10.875

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 10.875

Calculate the square root of the right side: 3.29772649

Break this problem into two subproblems by setting 
(x + -3.5) equal to 3.29772649 and -3.29772649.

Subproblem 1

x + -3.5 = 3.29772649 Simplifying x + -3.5 = 3.29772649 Reorder the terms: -3.5 + x = 3.29772649 Solving -3.5 + x = 3.29772649 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 3.29772649 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 3.29772649 + 3.5 x = 3.29772649 + 3.5 Combine like terms: 3.29772649 + 3.5 = 6.79772649 x = 6.79772649 Simplifying x = 6.79772649

Subproblem 2

x + -3.5 = -3.29772649 Simplifying x + -3.5 = -3.29772649 Reorder the terms: -3.5 + x = -3.29772649 Solving -3.5 + x = -3.29772649 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -3.29772649 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -3.29772649 + 3.5 x = -3.29772649 + 3.5 Combine like terms: -3.29772649 + 3.5 = 0.20227351 x = 0.20227351 Simplifying x = 0.20227351

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.79772649, 0.20227351}

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