25x^2-64x-1=0

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Solution for 25x^2-64x-1=0 equation:


Simplifying
25x2 + -64x + -1 = 0

Reorder the terms:
-1 + -64x + 25x2 = 0

Solving
-1 + -64x + 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'.
-0.04 + -2.56x + x2 = 0

Move the constant term to the right:

Add '0.04' to each side of the equation.
-0.04 + -2.56x + 0.04 + x2 = 0 + 0.04

Reorder the terms:
-0.04 + 0.04 + -2.56x + x2 = 0 + 0.04

Combine like terms: -0.04 + 0.04 = 0.00
0.00 + -2.56x + x2 = 0 + 0.04
-2.56x + x2 = 0 + 0.04

Combine like terms: 0 + 0.04 = 0.04
-2.56x + x2 = 0.04

The x term is -2.56x.  Take half its coefficient (-1.28).
Square it (1.6384) and add it to both sides.

Add '1.6384' to each side of the equation.
-2.56x + 1.6384 + x2 = 0.04 + 1.6384

Reorder the terms:
1.6384 + -2.56x + x2 = 0.04 + 1.6384

Combine like terms: 0.04 + 1.6384 = 1.6784
1.6384 + -2.56x + x2 = 1.6784

Factor a perfect square on the left side:
(x + -1.28)(x + -1.28) = 1.6784

Calculate the square root of the right side: 1.295530779

Break this problem into two subproblems by setting 
(x + -1.28) equal to 1.295530779 and -1.295530779.

Subproblem 1

x + -1.28 = 1.295530779 Simplifying x + -1.28 = 1.295530779 Reorder the terms: -1.28 + x = 1.295530779 Solving -1.28 + x = 1.295530779 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.28' to each side of the equation. -1.28 + 1.28 + x = 1.295530779 + 1.28 Combine like terms: -1.28 + 1.28 = 0.00 0.00 + x = 1.295530779 + 1.28 x = 1.295530779 + 1.28 Combine like terms: 1.295530779 + 1.28 = 2.575530779 x = 2.575530779 Simplifying x = 2.575530779

Subproblem 2

x + -1.28 = -1.295530779 Simplifying x + -1.28 = -1.295530779 Reorder the terms: -1.28 + x = -1.295530779 Solving -1.28 + x = -1.295530779 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.28' to each side of the equation. -1.28 + 1.28 + x = -1.295530779 + 1.28 Combine like terms: -1.28 + 1.28 = 0.00 0.00 + x = -1.295530779 + 1.28 x = -1.295530779 + 1.28 Combine like terms: -1.295530779 + 1.28 = -0.015530779 x = -0.015530779 Simplifying x = -0.015530779

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.575530779, -0.015530779}

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