16x^2-20x-20x-25=64

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Solution for 16x^2-20x-20x-25=64 equation:


Simplifying
16x2 + -20x + -20x + -25 = 64

Reorder the terms:
-25 + -20x + -20x + 16x2 = 64

Combine like terms: -20x + -20x = -40x
-25 + -40x + 16x2 = 64

Solving
-25 + -40x + 16x2 = 64

Solving for variable 'x'.

Reorder the terms:
-25 + -64 + -40x + 16x2 = 64 + -64

Combine like terms: -25 + -64 = -89
-89 + -40x + 16x2 = 64 + -64

Combine like terms: 64 + -64 = 0
-89 + -40x + 16x2 = 0

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

Divide each side by '16'.
-5.5625 + -2.5x + x2 = 0

Move the constant term to the right:

Add '5.5625' to each side of the equation.
-5.5625 + -2.5x + 5.5625 + x2 = 0 + 5.5625

Reorder the terms:
-5.5625 + 5.5625 + -2.5x + x2 = 0 + 5.5625

Combine like terms: -5.5625 + 5.5625 = 0.0000
0.0000 + -2.5x + x2 = 0 + 5.5625
-2.5x + x2 = 0 + 5.5625

Combine like terms: 0 + 5.5625 = 5.5625
-2.5x + x2 = 5.5625

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 = 5.5625 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 5.5625 + 1.5625

Combine like terms: 5.5625 + 1.5625 = 7.125
1.5625 + -2.5x + x2 = 7.125

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 7.125

Calculate the square root of the right side: 2.669269563

Break this problem into two subproblems by setting 
(x + -1.25) equal to 2.669269563 and -2.669269563.

Subproblem 1

x + -1.25 = 2.669269563 Simplifying x + -1.25 = 2.669269563 Reorder the terms: -1.25 + x = 2.669269563 Solving -1.25 + x = 2.669269563 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 = 2.669269563 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 2.669269563 + 1.25 x = 2.669269563 + 1.25 Combine like terms: 2.669269563 + 1.25 = 3.919269563 x = 3.919269563 Simplifying x = 3.919269563

Subproblem 2

x + -1.25 = -2.669269563 Simplifying x + -1.25 = -2.669269563 Reorder the terms: -1.25 + x = -2.669269563 Solving -1.25 + x = -2.669269563 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 = -2.669269563 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -2.669269563 + 1.25 x = -2.669269563 + 1.25 Combine like terms: -2.669269563 + 1.25 = -1.419269563 x = -1.419269563 Simplifying x = -1.419269563

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.919269563, -1.419269563}

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