8x^2-41x+15=0

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Solution for 8x^2-41x+15=0 equation:


Simplifying
8x2 + -41x + 15 = 0

Reorder the terms:
15 + -41x + 8x2 = 0

Solving
15 + -41x + 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'.
1.875 + -5.125x + x2 = 0

Move the constant term to the right:

Add '-1.875' to each side of the equation.
1.875 + -5.125x + -1.875 + x2 = 0 + -1.875

Reorder the terms:
1.875 + -1.875 + -5.125x + x2 = 0 + -1.875

Combine like terms: 1.875 + -1.875 = 0.000
0.000 + -5.125x + x2 = 0 + -1.875
-5.125x + x2 = 0 + -1.875

Combine like terms: 0 + -1.875 = -1.875
-5.125x + x2 = -1.875

The x term is -5.125x.  Take half its coefficient (-2.5625).
Square it (6.56640625) and add it to both sides.

Add '6.56640625' to each side of the equation.
-5.125x + 6.56640625 + x2 = -1.875 + 6.56640625

Reorder the terms:
6.56640625 + -5.125x + x2 = -1.875 + 6.56640625

Combine like terms: -1.875 + 6.56640625 = 4.69140625
6.56640625 + -5.125x + x2 = 4.69140625

Factor a perfect square on the left side:
(x + -2.5625)(x + -2.5625) = 4.69140625

Calculate the square root of the right side: 2.165965431

Break this problem into two subproblems by setting 
(x + -2.5625) equal to 2.165965431 and -2.165965431.

Subproblem 1

x + -2.5625 = 2.165965431 Simplifying x + -2.5625 = 2.165965431 Reorder the terms: -2.5625 + x = 2.165965431 Solving -2.5625 + x = 2.165965431 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5625' to each side of the equation. -2.5625 + 2.5625 + x = 2.165965431 + 2.5625 Combine like terms: -2.5625 + 2.5625 = 0.0000 0.0000 + x = 2.165965431 + 2.5625 x = 2.165965431 + 2.5625 Combine like terms: 2.165965431 + 2.5625 = 4.728465431 x = 4.728465431 Simplifying x = 4.728465431

Subproblem 2

x + -2.5625 = -2.165965431 Simplifying x + -2.5625 = -2.165965431 Reorder the terms: -2.5625 + x = -2.165965431 Solving -2.5625 + x = -2.165965431 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5625' to each side of the equation. -2.5625 + 2.5625 + x = -2.165965431 + 2.5625 Combine like terms: -2.5625 + 2.5625 = 0.0000 0.0000 + x = -2.165965431 + 2.5625 x = -2.165965431 + 2.5625 Combine like terms: -2.165965431 + 2.5625 = 0.396534569 x = 0.396534569 Simplifying x = 0.396534569

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.728465431, 0.396534569}

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