16x^2-40x-25=0

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Solution for 16x^2-40x-25=0 equation:


Simplifying
16x2 + -40x + -25 = 0

Reorder the terms:
-25 + -40x + 16x2 = 0

Solving
-25 + -40x + 16x2 = 0

Solving for variable 'x'.

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

Divide each side by '16'.
-1.5625 + -2.5x + x2 = 0

Move the constant term to the right:

Add '1.5625' to each side of the equation.
-1.5625 + -2.5x + 1.5625 + x2 = 0 + 1.5625

Reorder the terms:
-1.5625 + 1.5625 + -2.5x + x2 = 0 + 1.5625

Combine like terms: -1.5625 + 1.5625 = 0.0000
0.0000 + -2.5x + x2 = 0 + 1.5625
-2.5x + x2 = 0 + 1.5625

Combine like terms: 0 + 1.5625 = 1.5625
-2.5x + x2 = 1.5625

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 1.5625 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 1.5625 + 1.5625

Combine like terms: 1.5625 + 1.5625 = 3.125
1.5625 + -2.5x + x2 = 3.125

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 3.125

Calculate the square root of the right side: 1.767766953

Break this problem into two subproblems by setting 
(x + -1.25) equal to 1.767766953 and -1.767766953.

Subproblem 1

x + -1.25 = 1.767766953 Simplifying x + -1.25 = 1.767766953 Reorder the terms: -1.25 + x = 1.767766953 Solving -1.25 + x = 1.767766953 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 1.767766953 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 1.767766953 + 1.25 x = 1.767766953 + 1.25 Combine like terms: 1.767766953 + 1.25 = 3.017766953 x = 3.017766953 Simplifying x = 3.017766953

Subproblem 2

x + -1.25 = -1.767766953 Simplifying x + -1.25 = -1.767766953 Reorder the terms: -1.25 + x = -1.767766953 Solving -1.25 + x = -1.767766953 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -1.767766953 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -1.767766953 + 1.25 x = -1.767766953 + 1.25 Combine like terms: -1.767766953 + 1.25 = -0.517766953 x = -0.517766953 Simplifying x = -0.517766953

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.017766953, -0.517766953}

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