5x(x-1)=39

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Solution for 5x(x-1)=39 equation:


Simplifying
5x(x + -1) = 39

Reorder the terms:
5x(-1 + x) = 39
(-1 * 5x + x * 5x) = 39
(-5x + 5x2) = 39

Solving
-5x + 5x2 = 39

Solving for variable 'x'.

Reorder the terms:
-39 + -5x + 5x2 = 39 + -39

Combine like terms: 39 + -39 = 0
-39 + -5x + 5x2 = 0

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-7.8 + -1x + x2 = 0

Move the constant term to the right:

Add '7.8' to each side of the equation.
-7.8 + -1x + 7.8 + x2 = 0 + 7.8

Reorder the terms:
-7.8 + 7.8 + -1x + x2 = 0 + 7.8

Combine like terms: -7.8 + 7.8 = 0.0
0.0 + -1x + x2 = 0 + 7.8
-1x + x2 = 0 + 7.8

Combine like terms: 0 + 7.8 = 7.8
-1x + x2 = 7.8

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 = 7.8 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 7.8 + 0.25

Combine like terms: 7.8 + 0.25 = 8.05
0.25 + -1x + x2 = 8.05

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 8.05

Calculate the square root of the right side: 2.837252192

Break this problem into two subproblems by setting 
(x + -0.5) equal to 2.837252192 and -2.837252192.

Subproblem 1

x + -0.5 = 2.837252192 Simplifying x + -0.5 = 2.837252192 Reorder the terms: -0.5 + x = 2.837252192 Solving -0.5 + x = 2.837252192 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 = 2.837252192 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 2.837252192 + 0.5 x = 2.837252192 + 0.5 Combine like terms: 2.837252192 + 0.5 = 3.337252192 x = 3.337252192 Simplifying x = 3.337252192

Subproblem 2

x + -0.5 = -2.837252192 Simplifying x + -0.5 = -2.837252192 Reorder the terms: -0.5 + x = -2.837252192 Solving -0.5 + x = -2.837252192 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 = -2.837252192 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -2.837252192 + 0.5 x = -2.837252192 + 0.5 Combine like terms: -2.837252192 + 0.5 = -2.337252192 x = -2.337252192 Simplifying x = -2.337252192

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.337252192, -2.337252192}

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