x(x-1)=79

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Solution for x(x-1)=79 equation:


Simplifying
x(x + -1) = 79

Reorder the terms:
x(-1 + x) = 79
(-1 * x + x * x) = 79
(-1x + x2) = 79

Solving
-1x + x2 = 79

Solving for variable 'x'.

Reorder the terms:
-79 + -1x + x2 = 79 + -79

Combine like terms: 79 + -79 = 0
-79 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '79' to each side of the equation.
-79 + -1x + 79 + x2 = 0 + 79

Reorder the terms:
-79 + 79 + -1x + x2 = 0 + 79

Combine like terms: -79 + 79 = 0
0 + -1x + x2 = 0 + 79
-1x + x2 = 0 + 79

Combine like terms: 0 + 79 = 79
-1x + x2 = 79

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 = 79 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 79 + 0.25

Combine like terms: 79 + 0.25 = 79.25
0.25 + -1x + x2 = 79.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 79.25

Calculate the square root of the right side: 8.902246907

Break this problem into two subproblems by setting 
(x + -0.5) equal to 8.902246907 and -8.902246907.

Subproblem 1

x + -0.5 = 8.902246907 Simplifying x + -0.5 = 8.902246907 Reorder the terms: -0.5 + x = 8.902246907 Solving -0.5 + x = 8.902246907 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 = 8.902246907 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 8.902246907 + 0.5 x = 8.902246907 + 0.5 Combine like terms: 8.902246907 + 0.5 = 9.402246907 x = 9.402246907 Simplifying x = 9.402246907

Subproblem 2

x + -0.5 = -8.902246907 Simplifying x + -0.5 = -8.902246907 Reorder the terms: -0.5 + x = -8.902246907 Solving -0.5 + x = -8.902246907 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 = -8.902246907 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -8.902246907 + 0.5 x = -8.902246907 + 0.5 Combine like terms: -8.902246907 + 0.5 = -8.402246907 x = -8.402246907 Simplifying x = -8.402246907

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.402246907, -8.402246907}

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