195=x*(x+1)

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Solution for 195=x*(x+1) equation:


Simplifying
195 = x(x + 1)

Reorder the terms:
195 = x(1 + x)
195 = (1 * x + x * x)
195 = (1x + x2)

Solving
195 = 1x + x2

Solving for variable 'x'.

Reorder the terms:
195 + -1x + -1x2 = 1x + -1x + x2 + -1x2

Combine like terms: 1x + -1x = 0
195 + -1x + -1x2 = 0 + x2 + -1x2
195 + -1x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
195 + -1x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-195 + x + x2 = 0

Move the constant term to the right:

Add '195' to each side of the equation.
-195 + x + 195 + x2 = 0 + 195

Reorder the terms:
-195 + 195 + x + x2 = 0 + 195

Combine like terms: -195 + 195 = 0
0 + x + x2 = 0 + 195
x + x2 = 0 + 195

Combine like terms: 0 + 195 = 195
x + x2 = 195

The x term is x.  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.
 + 0.25 + x2 = 195 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 195 + 0.25

Combine like terms: 195 + 0.25 = 195.25
1.25 + x2 = 195.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 195.25

Calculate the square root of the right side: 13.973188612

Break this problem into two subproblems by setting 
(x + 0.5) equal to 13.973188612 and -13.973188612.

Subproblem 1

x + 0.5 = 13.973188612 Simplifying x + 0.5 = 13.973188612 Reorder the terms: 0.5 + x = 13.973188612 Solving 0.5 + x = 13.973188612 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 = 13.973188612 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 13.973188612 + -0.5 x = 13.973188612 + -0.5 Combine like terms: 13.973188612 + -0.5 = 13.473188612 x = 13.473188612 Simplifying x = 13.473188612

Subproblem 2

x + 0.5 = -13.973188612 Simplifying x + 0.5 = -13.973188612 Reorder the terms: 0.5 + x = -13.973188612 Solving 0.5 + x = -13.973188612 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 = -13.973188612 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -13.973188612 + -0.5 x = -13.973188612 + -0.5 Combine like terms: -13.973188612 + -0.5 = -14.473188612 x = -14.473188612 Simplifying x = -14.473188612

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.473188612, -14.473188612}

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