25x^2-16x-8=0

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Solution for 25x^2-16x-8=0 equation:


Simplifying
25x2 + -16x + -8 = 0

Reorder the terms:
-8 + -16x + 25x2 = 0

Solving
-8 + -16x + 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 + -0.64x + x2 = 0

Move the constant term to the right:

Add '0.32' to each side of the equation.
-0.32 + -0.64x + 0.32 + x2 = 0 + 0.32

Reorder the terms:
-0.32 + 0.32 + -0.64x + x2 = 0 + 0.32

Combine like terms: -0.32 + 0.32 = 0.00
0.00 + -0.64x + x2 = 0 + 0.32
-0.64x + x2 = 0 + 0.32

Combine like terms: 0 + 0.32 = 0.32
-0.64x + x2 = 0.32

The x term is -0.64x.  Take half its coefficient (-0.32).
Square it (0.1024) and add it to both sides.

Add '0.1024' to each side of the equation.
-0.64x + 0.1024 + x2 = 0.32 + 0.1024

Reorder the terms:
0.1024 + -0.64x + x2 = 0.32 + 0.1024

Combine like terms: 0.32 + 0.1024 = 0.4224
0.1024 + -0.64x + x2 = 0.4224

Factor a perfect square on the left side:
(x + -0.32)(x + -0.32) = 0.4224

Calculate the square root of the right side: 0.649923072

Break this problem into two subproblems by setting 
(x + -0.32) equal to 0.649923072 and -0.649923072.

Subproblem 1

x + -0.32 = 0.649923072 Simplifying x + -0.32 = 0.649923072 Reorder the terms: -0.32 + x = 0.649923072 Solving -0.32 + x = 0.649923072 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.32' to each side of the equation. -0.32 + 0.32 + x = 0.649923072 + 0.32 Combine like terms: -0.32 + 0.32 = 0.00 0.00 + x = 0.649923072 + 0.32 x = 0.649923072 + 0.32 Combine like terms: 0.649923072 + 0.32 = 0.969923072 x = 0.969923072 Simplifying x = 0.969923072

Subproblem 2

x + -0.32 = -0.649923072 Simplifying x + -0.32 = -0.649923072 Reorder the terms: -0.32 + x = -0.649923072 Solving -0.32 + x = -0.649923072 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.32' to each side of the equation. -0.32 + 0.32 + x = -0.649923072 + 0.32 Combine like terms: -0.32 + 0.32 = 0.00 0.00 + x = -0.649923072 + 0.32 x = -0.649923072 + 0.32 Combine like terms: -0.649923072 + 0.32 = -0.329923072 x = -0.329923072 Simplifying x = -0.329923072

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.969923072, -0.329923072}

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