x^2-x-8=65

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Solution for x^2-x-8=65 equation:


Simplifying
x2 + -1x + -8 = 65

Reorder the terms:
-8 + -1x + x2 = 65

Solving
-8 + -1x + x2 = 65

Solving for variable 'x'.

Reorder the terms:
-8 + -65 + -1x + x2 = 65 + -65

Combine like terms: -8 + -65 = -73
-73 + -1x + x2 = 65 + -65

Combine like terms: 65 + -65 = 0
-73 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '73' to each side of the equation.
-73 + -1x + 73 + x2 = 0 + 73

Reorder the terms:
-73 + 73 + -1x + x2 = 0 + 73

Combine like terms: -73 + 73 = 0
0 + -1x + x2 = 0 + 73
-1x + x2 = 0 + 73

Combine like terms: 0 + 73 = 73
-1x + x2 = 73

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 = 73 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 73 + 0.25

Combine like terms: 73 + 0.25 = 73.25
0.25 + -1x + x2 = 73.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 73.25

Calculate the square root of the right side: 8.558621384

Break this problem into two subproblems by setting 
(x + -0.5) equal to 8.558621384 and -8.558621384.

Subproblem 1

x + -0.5 = 8.558621384 Simplifying x + -0.5 = 8.558621384 Reorder the terms: -0.5 + x = 8.558621384 Solving -0.5 + x = 8.558621384 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 = 8.558621384 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 8.558621384 + 0.5 x = 8.558621384 + 0.5 Combine like terms: 8.558621384 + 0.5 = 9.058621384 x = 9.058621384 Simplifying x = 9.058621384

Subproblem 2

x + -0.5 = -8.558621384 Simplifying x + -0.5 = -8.558621384 Reorder the terms: -0.5 + x = -8.558621384 Solving -0.5 + x = -8.558621384 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 = -8.558621384 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -8.558621384 + 0.5 x = -8.558621384 + 0.5 Combine like terms: -8.558621384 + 0.5 = -8.058621384 x = -8.058621384 Simplifying x = -8.058621384

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.058621384, -8.058621384}

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