0=8x^2-10x-105

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Solution for 0=8x^2-10x-105 equation:


Simplifying
0 = 8x2 + -10x + -105

Reorder the terms:
0 = -105 + -10x + 8x2

Solving
0 = -105 + -10x + 8x2

Solving for variable 'x'.

Combine like terms: 0 + 105 = 105
105 + 10x + -8x2 = -105 + -10x + 8x2 + 105 + 10x + -8x2

Reorder the terms:
105 + 10x + -8x2 = -105 + 105 + -10x + 10x + 8x2 + -8x2

Combine like terms: -105 + 105 = 0
105 + 10x + -8x2 = 0 + -10x + 10x + 8x2 + -8x2
105 + 10x + -8x2 = -10x + 10x + 8x2 + -8x2

Combine like terms: -10x + 10x = 0
105 + 10x + -8x2 = 0 + 8x2 + -8x2
105 + 10x + -8x2 = 8x2 + -8x2

Combine like terms: 8x2 + -8x2 = 0
105 + 10x + -8x2 = 0

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

Divide each side by '-8'.
-13.125 + -1.25x + x2 = 0

Move the constant term to the right:

Add '13.125' to each side of the equation.
-13.125 + -1.25x + 13.125 + x2 = 0 + 13.125

Reorder the terms:
-13.125 + 13.125 + -1.25x + x2 = 0 + 13.125

Combine like terms: -13.125 + 13.125 = 0.000
0.000 + -1.25x + x2 = 0 + 13.125
-1.25x + x2 = 0 + 13.125

Combine like terms: 0 + 13.125 = 13.125
-1.25x + x2 = 13.125

The x term is -1.25x.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25x + 0.390625 + x2 = 13.125 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = 13.125 + 0.390625

Combine like terms: 13.125 + 0.390625 = 13.515625
0.390625 + -1.25x + x2 = 13.515625

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 13.515625

Calculate the square root of the right side: 3.676360292

Break this problem into two subproblems by setting 
(x + -0.625) equal to 3.676360292 and -3.676360292.

Subproblem 1

x + -0.625 = 3.676360292 Simplifying x + -0.625 = 3.676360292 Reorder the terms: -0.625 + x = 3.676360292 Solving -0.625 + x = 3.676360292 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = 3.676360292 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 3.676360292 + 0.625 x = 3.676360292 + 0.625 Combine like terms: 3.676360292 + 0.625 = 4.301360292 x = 4.301360292 Simplifying x = 4.301360292

Subproblem 2

x + -0.625 = -3.676360292 Simplifying x + -0.625 = -3.676360292 Reorder the terms: -0.625 + x = -3.676360292 Solving -0.625 + x = -3.676360292 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = -3.676360292 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -3.676360292 + 0.625 x = -3.676360292 + 0.625 Combine like terms: -3.676360292 + 0.625 = -3.051360292 x = -3.051360292 Simplifying x = -3.051360292

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.301360292, -3.051360292}

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