x^2-x=75

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Solution for x^2-x=75 equation:


Simplifying
x2 + -1x = 75

Reorder the terms:
-1x + x2 = 75

Solving
-1x + x2 = 75

Solving for variable 'x'.

Reorder the terms:
-75 + -1x + x2 = 75 + -75

Combine like terms: 75 + -75 = 0
-75 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '75' to each side of the equation.
-75 + -1x + 75 + x2 = 0 + 75

Reorder the terms:
-75 + 75 + -1x + x2 = 0 + 75

Combine like terms: -75 + 75 = 0
0 + -1x + x2 = 0 + 75
-1x + x2 = 0 + 75

Combine like terms: 0 + 75 = 75
-1x + x2 = 75

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 = 75 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 75 + 0.25

Combine like terms: 75 + 0.25 = 75.25
0.25 + -1x + x2 = 75.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 75.25

Calculate the square root of the right side: 8.674675786

Break this problem into two subproblems by setting 
(x + -0.5) equal to 8.674675786 and -8.674675786.

Subproblem 1

x + -0.5 = 8.674675786 Simplifying x + -0.5 = 8.674675786 Reorder the terms: -0.5 + x = 8.674675786 Solving -0.5 + x = 8.674675786 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 = 8.674675786 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 8.674675786 + 0.5 x = 8.674675786 + 0.5 Combine like terms: 8.674675786 + 0.5 = 9.174675786 x = 9.174675786 Simplifying x = 9.174675786

Subproblem 2

x + -0.5 = -8.674675786 Simplifying x + -0.5 = -8.674675786 Reorder the terms: -0.5 + x = -8.674675786 Solving -0.5 + x = -8.674675786 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 = -8.674675786 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -8.674675786 + 0.5 x = -8.674675786 + 0.5 Combine like terms: -8.674675786 + 0.5 = -8.174675786 x = -8.174675786 Simplifying x = -8.174675786

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.174675786, -8.174675786}

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