x^2-x=64

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Solution for x^2-x=64 equation:


Simplifying
x2 + -1x = 64

Reorder the terms:
-1x + x2 = 64

Solving
-1x + x2 = 64

Solving for variable 'x'.

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

Combine like terms: 64 + -64 = 0
-64 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + -1x + 64 + x2 = 0 + 64

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

Combine like terms: -64 + 64 = 0
0 + -1x + x2 = 0 + 64
-1x + x2 = 0 + 64

Combine like terms: 0 + 64 = 64
-1x + x2 = 64

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 64 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 64 + 0.25

Combine like terms: 64 + 0.25 = 64.25
0.25 + -1x + x2 = 64.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 64.25

Calculate the square root of the right side: 8.015609771

Break this problem into two subproblems by setting 
(x + -0.5) equal to 8.015609771 and -8.015609771.

Subproblem 1

x + -0.5 = 8.015609771 Simplifying x + -0.5 = 8.015609771 Reorder the terms: -0.5 + x = 8.015609771 Solving -0.5 + x = 8.015609771 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 8.015609771 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 8.015609771 + 0.5 x = 8.015609771 + 0.5 Combine like terms: 8.015609771 + 0.5 = 8.515609771 x = 8.515609771 Simplifying x = 8.515609771

Subproblem 2

x + -0.5 = -8.015609771 Simplifying x + -0.5 = -8.015609771 Reorder the terms: -0.5 + x = -8.015609771 Solving -0.5 + x = -8.015609771 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -8.015609771 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -8.015609771 + 0.5 x = -8.015609771 + 0.5 Combine like terms: -8.015609771 + 0.5 = -7.515609771 x = -7.515609771 Simplifying x = -7.515609771

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.515609771, -7.515609771}

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