8x^2-9x=5

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Solution for 8x^2-9x=5 equation:


Simplifying
8x2 + -9x = 5

Reorder the terms:
-9x + 8x2 = 5

Solving
-9x + 8x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + -9x + 8x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -9x + 8x2 = 0

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

Divide each side by '8'.
-0.625 + -1.125x + x2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + -1.125x + 0.625 + x2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + -1.125x + x2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + -1.125x + x2 = 0 + 0.625
-1.125x + x2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
-1.125x + x2 = 0.625

The x term is -1.125x.  Take half its coefficient (-0.5625).
Square it (0.31640625) and add it to both sides.

Add '0.31640625' to each side of the equation.
-1.125x + 0.31640625 + x2 = 0.625 + 0.31640625

Reorder the terms:
0.31640625 + -1.125x + x2 = 0.625 + 0.31640625

Combine like terms: 0.625 + 0.31640625 = 0.94140625
0.31640625 + -1.125x + x2 = 0.94140625

Factor a perfect square on the left side:
(x + -0.5625)(x + -0.5625) = 0.94140625

Calculate the square root of the right side: 0.970260919

Break this problem into two subproblems by setting 
(x + -0.5625) equal to 0.970260919 and -0.970260919.

Subproblem 1

x + -0.5625 = 0.970260919 Simplifying x + -0.5625 = 0.970260919 Reorder the terms: -0.5625 + x = 0.970260919 Solving -0.5625 + x = 0.970260919 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + x = 0.970260919 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + x = 0.970260919 + 0.5625 x = 0.970260919 + 0.5625 Combine like terms: 0.970260919 + 0.5625 = 1.532760919 x = 1.532760919 Simplifying x = 1.532760919

Subproblem 2

x + -0.5625 = -0.970260919 Simplifying x + -0.5625 = -0.970260919 Reorder the terms: -0.5625 + x = -0.970260919 Solving -0.5625 + x = -0.970260919 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + x = -0.970260919 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + x = -0.970260919 + 0.5625 x = -0.970260919 + 0.5625 Combine like terms: -0.970260919 + 0.5625 = -0.407760919 x = -0.407760919 Simplifying x = -0.407760919

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.532760919, -0.407760919}

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