X(X+1)=138

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Solution for X(X+1)=138 equation:


Simplifying
X(X + 1) = 138

Reorder the terms:
X(1 + X) = 138
(1 * X + X * X) = 138
(1X + X2) = 138

Solving
1X + X2 = 138

Solving for variable 'X'.

Reorder the terms:
-138 + 1X + X2 = 138 + -138

Combine like terms: 138 + -138 = 0
-138 + 1X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '138' to each side of the equation.
-138 + 1X + 138 + X2 = 0 + 138

Reorder the terms:
-138 + 138 + 1X + X2 = 0 + 138

Combine like terms: -138 + 138 = 0
0 + 1X + X2 = 0 + 138
1X + X2 = 0 + 138

Combine like terms: 0 + 138 = 138
1X + X2 = 138

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 = 138 + 0.25

Reorder the terms:
0.25 + X + X2 = 138 + 0.25

Combine like terms: 138 + 0.25 = 138.25
0.25 + X + X2 = 138.25

Factor a perfect square on the left side:
(X + 0.5)(X + 0.5) = 138.25

Calculate the square root of the right side: 11.757976016

Break this problem into two subproblems by setting 
(X + 0.5) equal to 11.757976016 and -11.757976016.

Subproblem 1

X + 0.5 = 11.757976016 Simplifying X + 0.5 = 11.757976016 Reorder the terms: 0.5 + X = 11.757976016 Solving 0.5 + X = 11.757976016 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 = 11.757976016 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + X = 11.757976016 + -0.5 X = 11.757976016 + -0.5 Combine like terms: 11.757976016 + -0.5 = 11.257976016 X = 11.257976016 Simplifying X = 11.257976016

Subproblem 2

X + 0.5 = -11.757976016 Simplifying X + 0.5 = -11.757976016 Reorder the terms: 0.5 + X = -11.757976016 Solving 0.5 + X = -11.757976016 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 = -11.757976016 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + X = -11.757976016 + -0.5 X = -11.757976016 + -0.5 Combine like terms: -11.757976016 + -0.5 = -12.257976016 X = -12.257976016 Simplifying X = -12.257976016

Solution

The solution to the problem is based on the solutions from the subproblems. X = {11.257976016, -12.257976016}

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