25x^2-40x+8=0

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Solution for 25x^2-40x+8=0 equation:


Simplifying
25x2 + -40x + 8 = 0

Reorder the terms:
8 + -40x + 25x2 = 0

Solving
8 + -40x + 25x2 = 0

Solving for variable 'x'.

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

Divide each side by '25'.
0.32 + -1.6x + x2 = 0

Move the constant term to the right:

Add '-0.32' to each side of the equation.
0.32 + -1.6x + -0.32 + x2 = 0 + -0.32

Reorder the terms:
0.32 + -0.32 + -1.6x + x2 = 0 + -0.32

Combine like terms: 0.32 + -0.32 = 0.00
0.00 + -1.6x + x2 = 0 + -0.32
-1.6x + x2 = 0 + -0.32

Combine like terms: 0 + -0.32 = -0.32
-1.6x + x2 = -0.32

The x term is -1.6x.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6x + 0.64 + x2 = -0.32 + 0.64

Reorder the terms:
0.64 + -1.6x + x2 = -0.32 + 0.64

Combine like terms: -0.32 + 0.64 = 0.32
0.64 + -1.6x + x2 = 0.32

Factor a perfect square on the left side:
(x + -0.8)(x + -0.8) = 0.32

Calculate the square root of the right side: 0.565685425

Break this problem into two subproblems by setting 
(x + -0.8) equal to 0.565685425 and -0.565685425.

Subproblem 1

x + -0.8 = 0.565685425 Simplifying x + -0.8 = 0.565685425 Reorder the terms: -0.8 + x = 0.565685425 Solving -0.8 + x = 0.565685425 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = 0.565685425 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = 0.565685425 + 0.8 x = 0.565685425 + 0.8 Combine like terms: 0.565685425 + 0.8 = 1.365685425 x = 1.365685425 Simplifying x = 1.365685425

Subproblem 2

x + -0.8 = -0.565685425 Simplifying x + -0.8 = -0.565685425 Reorder the terms: -0.8 + x = -0.565685425 Solving -0.8 + x = -0.565685425 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = -0.565685425 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = -0.565685425 + 0.8 x = -0.565685425 + 0.8 Combine like terms: -0.565685425 + 0.8 = 0.234314575 x = 0.234314575 Simplifying x = 0.234314575

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.365685425, 0.234314575}

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