25x^2-16x-5=0

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Solution for 25x^2-16x-5=0 equation:


Simplifying
25x2 + -16x + -5 = 0

Reorder the terms:
-5 + -16x + 25x2 = 0

Solving
-5 + -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'.
-0.2 + -0.64x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -0.64x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -0.64x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -0.64x + x2 = 0 + 0.2
-0.64x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-0.64x + x2 = 0.2

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 = 0.2 + 0.1024

Reorder the terms:
0.1024 + -0.64x + x2 = 0.2 + 0.1024

Combine like terms: 0.2 + 0.1024 = 0.3024
0.1024 + -0.64x + x2 = 0.3024

Factor a perfect square on the left side:
(x + -0.32)(x + -0.32) = 0.3024

Calculate the square root of the right side: 0.549909083

Break this problem into two subproblems by setting 
(x + -0.32) equal to 0.549909083 and -0.549909083.

Subproblem 1

x + -0.32 = 0.549909083 Simplifying x + -0.32 = 0.549909083 Reorder the terms: -0.32 + x = 0.549909083 Solving -0.32 + x = 0.549909083 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 = 0.549909083 + 0.32 Combine like terms: -0.32 + 0.32 = 0.00 0.00 + x = 0.549909083 + 0.32 x = 0.549909083 + 0.32 Combine like terms: 0.549909083 + 0.32 = 0.869909083 x = 0.869909083 Simplifying x = 0.869909083

Subproblem 2

x + -0.32 = -0.549909083 Simplifying x + -0.32 = -0.549909083 Reorder the terms: -0.32 + x = -0.549909083 Solving -0.32 + x = -0.549909083 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 = -0.549909083 + 0.32 Combine like terms: -0.32 + 0.32 = 0.00 0.00 + x = -0.549909083 + 0.32 x = -0.549909083 + 0.32 Combine like terms: -0.549909083 + 0.32 = -0.229909083 x = -0.229909083 Simplifying x = -0.229909083

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.869909083, -0.229909083}

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