8x^2-87x+45=0

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Solution for 8x^2-87x+45=0 equation:


Simplifying
8x2 + -87x + 45 = 0

Reorder the terms:
45 + -87x + 8x2 = 0

Solving
45 + -87x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
5.625 + -10.875x + x2 = 0

Move the constant term to the right:

Add '-5.625' to each side of the equation.
5.625 + -10.875x + -5.625 + x2 = 0 + -5.625

Reorder the terms:
5.625 + -5.625 + -10.875x + x2 = 0 + -5.625

Combine like terms: 5.625 + -5.625 = 0.000
0.000 + -10.875x + x2 = 0 + -5.625
-10.875x + x2 = 0 + -5.625

Combine like terms: 0 + -5.625 = -5.625
-10.875x + x2 = -5.625

The x term is -10.875x.  Take half its coefficient (-5.4375).
Square it (29.56640625) and add it to both sides.

Add '29.56640625' to each side of the equation.
-10.875x + 29.56640625 + x2 = -5.625 + 29.56640625

Reorder the terms:
29.56640625 + -10.875x + x2 = -5.625 + 29.56640625

Combine like terms: -5.625 + 29.56640625 = 23.94140625
29.56640625 + -10.875x + x2 = 23.94140625

Factor a perfect square on the left side:
(x + -5.4375)(x + -5.4375) = 23.94140625

Calculate the square root of the right side: 4.892995632

Break this problem into two subproblems by setting 
(x + -5.4375) equal to 4.892995632 and -4.892995632.

Subproblem 1

x + -5.4375 = 4.892995632 Simplifying x + -5.4375 = 4.892995632 Reorder the terms: -5.4375 + x = 4.892995632 Solving -5.4375 + x = 4.892995632 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.4375' to each side of the equation. -5.4375 + 5.4375 + x = 4.892995632 + 5.4375 Combine like terms: -5.4375 + 5.4375 = 0.0000 0.0000 + x = 4.892995632 + 5.4375 x = 4.892995632 + 5.4375 Combine like terms: 4.892995632 + 5.4375 = 10.330495632 x = 10.330495632 Simplifying x = 10.330495632

Subproblem 2

x + -5.4375 = -4.892995632 Simplifying x + -5.4375 = -4.892995632 Reorder the terms: -5.4375 + x = -4.892995632 Solving -5.4375 + x = -4.892995632 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.4375' to each side of the equation. -5.4375 + 5.4375 + x = -4.892995632 + 5.4375 Combine like terms: -5.4375 + 5.4375 = 0.0000 0.0000 + x = -4.892995632 + 5.4375 x = -4.892995632 + 5.4375 Combine like terms: -4.892995632 + 5.4375 = 0.544504368 x = 0.544504368 Simplifying x = 0.544504368

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.330495632, 0.544504368}

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