8x^2-40x+5=0

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Solution for 8x^2-40x+5=0 equation:


Simplifying
8x2 + -40x + 5 = 0

Reorder the terms:
5 + -40x + 8x2 = 0

Solving
5 + -40x + 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'.
0.625 + -5x + x2 = 0

Move the constant term to the right:

Add '-0.625' to each side of the equation.
0.625 + -5x + -0.625 + x2 = 0 + -0.625

Reorder the terms:
0.625 + -0.625 + -5x + x2 = 0 + -0.625

Combine like terms: 0.625 + -0.625 = 0.000
0.000 + -5x + x2 = 0 + -0.625
-5x + x2 = 0 + -0.625

Combine like terms: 0 + -0.625 = -0.625
-5x + x2 = -0.625

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = -0.625 + 6.25

Reorder the terms:
6.25 + -5x + x2 = -0.625 + 6.25

Combine like terms: -0.625 + 6.25 = 5.625
6.25 + -5x + x2 = 5.625

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 5.625

Calculate the square root of the right side: 2.371708245

Break this problem into two subproblems by setting 
(x + -2.5) equal to 2.371708245 and -2.371708245.

Subproblem 1

x + -2.5 = 2.371708245 Simplifying x + -2.5 = 2.371708245 Reorder the terms: -2.5 + x = 2.371708245 Solving -2.5 + x = 2.371708245 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 2.371708245 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 2.371708245 + 2.5 x = 2.371708245 + 2.5 Combine like terms: 2.371708245 + 2.5 = 4.871708245 x = 4.871708245 Simplifying x = 4.871708245

Subproblem 2

x + -2.5 = -2.371708245 Simplifying x + -2.5 = -2.371708245 Reorder the terms: -2.5 + x = -2.371708245 Solving -2.5 + x = -2.371708245 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -2.371708245 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -2.371708245 + 2.5 x = -2.371708245 + 2.5 Combine like terms: -2.371708245 + 2.5 = 0.128291755 x = 0.128291755 Simplifying x = 0.128291755

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.871708245, 0.128291755}

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