x^2-28x-64=0

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Solution for x^2-28x-64=0 equation:


Simplifying
x2 + -28x + -64 = 0

Reorder the terms:
-64 + -28x + x2 = 0

Solving
-64 + -28x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + -28x + 64 + x2 = 0 + 64

Reorder the terms:
-64 + 64 + -28x + x2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + -28x + x2 = 0 + 64
-28x + x2 = 0 + 64

Combine like terms: 0 + 64 = 64
-28x + x2 = 64

The x term is -28x.  Take half its coefficient (-14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
-28x + 196 + x2 = 64 + 196

Reorder the terms:
196 + -28x + x2 = 64 + 196

Combine like terms: 64 + 196 = 260
196 + -28x + x2 = 260

Factor a perfect square on the left side:
(x + -14)(x + -14) = 260

Calculate the square root of the right side: 16.124515497

Break this problem into two subproblems by setting 
(x + -14) equal to 16.124515497 and -16.124515497.

Subproblem 1

x + -14 = 16.124515497 Simplifying x + -14 = 16.124515497 Reorder the terms: -14 + x = 16.124515497 Solving -14 + x = 16.124515497 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = 16.124515497 + 14 Combine like terms: -14 + 14 = 0 0 + x = 16.124515497 + 14 x = 16.124515497 + 14 Combine like terms: 16.124515497 + 14 = 30.124515497 x = 30.124515497 Simplifying x = 30.124515497

Subproblem 2

x + -14 = -16.124515497 Simplifying x + -14 = -16.124515497 Reorder the terms: -14 + x = -16.124515497 Solving -14 + x = -16.124515497 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = -16.124515497 + 14 Combine like terms: -14 + 14 = 0 0 + x = -16.124515497 + 14 x = -16.124515497 + 14 Combine like terms: -16.124515497 + 14 = -2.124515497 x = -2.124515497 Simplifying x = -2.124515497

Solution

The solution to the problem is based on the solutions from the subproblems. x = {30.124515497, -2.124515497}

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