0=8x^2-6x-7

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Solution for 0=8x^2-6x-7 equation:


Simplifying
0 = 8x2 + -6x + -7

Reorder the terms:
0 = -7 + -6x + 8x2

Solving
0 = -7 + -6x + 8x2

Solving for variable 'x'.

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

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

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

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

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

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

Divide each side by '-8'.
-0.875 + -0.75x + x2 = 0

Move the constant term to the right:

Add '0.875' to each side of the equation.
-0.875 + -0.75x + 0.875 + x2 = 0 + 0.875

Reorder the terms:
-0.875 + 0.875 + -0.75x + x2 = 0 + 0.875

Combine like terms: -0.875 + 0.875 = 0.000
0.000 + -0.75x + x2 = 0 + 0.875
-0.75x + x2 = 0 + 0.875

Combine like terms: 0 + 0.875 = 0.875
-0.75x + x2 = 0.875

The x term is -0.75x.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75x + 0.140625 + x2 = 0.875 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 0.875 + 0.140625

Combine like terms: 0.875 + 0.140625 = 1.015625
0.140625 + -0.75x + x2 = 1.015625

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 1.015625

Calculate the square root of the right side: 1.007782219

Break this problem into two subproblems by setting 
(x + -0.375) equal to 1.007782219 and -1.007782219.

Subproblem 1

x + -0.375 = 1.007782219 Simplifying x + -0.375 = 1.007782219 Reorder the terms: -0.375 + x = 1.007782219 Solving -0.375 + x = 1.007782219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = 1.007782219 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 1.007782219 + 0.375 x = 1.007782219 + 0.375 Combine like terms: 1.007782219 + 0.375 = 1.382782219 x = 1.382782219 Simplifying x = 1.382782219

Subproblem 2

x + -0.375 = -1.007782219 Simplifying x + -0.375 = -1.007782219 Reorder the terms: -0.375 + x = -1.007782219 Solving -0.375 + x = -1.007782219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = -1.007782219 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -1.007782219 + 0.375 x = -1.007782219 + 0.375 Combine like terms: -1.007782219 + 0.375 = -0.632782219 x = -0.632782219 Simplifying x = -0.632782219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.382782219, -0.632782219}

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