4x^2-64x-25=0

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Solution for 4x^2-64x-25=0 equation:


Simplifying
4x2 + -64x + -25 = 0

Reorder the terms:
-25 + -64x + 4x2 = 0

Solving
-25 + -64x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-6.25 + -16x + x2 = 0

Move the constant term to the right:

Add '6.25' to each side of the equation.
-6.25 + -16x + 6.25 + x2 = 0 + 6.25

Reorder the terms:
-6.25 + 6.25 + -16x + x2 = 0 + 6.25

Combine like terms: -6.25 + 6.25 = 0.00
0.00 + -16x + x2 = 0 + 6.25
-16x + x2 = 0 + 6.25

Combine like terms: 0 + 6.25 = 6.25
-16x + x2 = 6.25

The x term is -16x.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16x + 64 + x2 = 6.25 + 64

Reorder the terms:
64 + -16x + x2 = 6.25 + 64

Combine like terms: 6.25 + 64 = 70.25
64 + -16x + x2 = 70.25

Factor a perfect square on the left side:
(x + -8)(x + -8) = 70.25

Calculate the square root of the right side: 8.381527307

Break this problem into two subproblems by setting 
(x + -8) equal to 8.381527307 and -8.381527307.

Subproblem 1

x + -8 = 8.381527307 Simplifying x + -8 = 8.381527307 Reorder the terms: -8 + x = 8.381527307 Solving -8 + x = 8.381527307 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = 8.381527307 + 8 Combine like terms: -8 + 8 = 0 0 + x = 8.381527307 + 8 x = 8.381527307 + 8 Combine like terms: 8.381527307 + 8 = 16.381527307 x = 16.381527307 Simplifying x = 16.381527307

Subproblem 2

x + -8 = -8.381527307 Simplifying x + -8 = -8.381527307 Reorder the terms: -8 + x = -8.381527307 Solving -8 + x = -8.381527307 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = -8.381527307 + 8 Combine like terms: -8 + 8 = 0 0 + x = -8.381527307 + 8 x = -8.381527307 + 8 Combine like terms: -8.381527307 + 8 = -0.381527307 x = -0.381527307 Simplifying x = -0.381527307

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.381527307, -0.381527307}

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