x(x+1)=195

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


Simplifying
x(x + 1) = 195

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

Solving
1x + x2 = 195

Solving for variable 'x'.

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

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

Begin completing the square.

Move the constant term to the right:

Add '195' to each side of the equation.
-195 + 1x + 195 + x2 = 0 + 195

Reorder the terms:
-195 + 195 + 1x + x2 = 0 + 195

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

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

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.
x + 0.25 + x2 = 195 + 0.25

Reorder the terms:
0.25 + x + x2 = 195 + 0.25

Combine like terms: 195 + 0.25 = 195.25
0.25 + x + 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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