x(x+1)=120

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Solution for x(x+1)=120 equation:


Simplifying
x(x + 1) = 120

Reorder the terms:
x(1 + x) = 120
(1 * x + x * x) = 120
(1x + x2) = 120

Solving
1x + x2 = 120

Solving for variable 'x'.

Reorder the terms:
-120 + 1x + x2 = 120 + -120

Combine like terms: 120 + -120 = 0
-120 + 1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '120' to each side of the equation.
-120 + 1x + 120 + x2 = 0 + 120

Reorder the terms:
-120 + 120 + 1x + x2 = 0 + 120

Combine like terms: -120 + 120 = 0
0 + 1x + x2 = 0 + 120
1x + x2 = 0 + 120

Combine like terms: 0 + 120 = 120
1x + x2 = 120

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 = 120 + 0.25

Reorder the terms:
0.25 + x + x2 = 120 + 0.25

Combine like terms: 120 + 0.25 = 120.25
0.25 + x + x2 = 120.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 120.25

Calculate the square root of the right side: 10.9658561

Break this problem into two subproblems by setting 
(x + 0.5) equal to 10.9658561 and -10.9658561.

Subproblem 1

x + 0.5 = 10.9658561 Simplifying x + 0.5 = 10.9658561 Reorder the terms: 0.5 + x = 10.9658561 Solving 0.5 + x = 10.9658561 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 = 10.9658561 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 10.9658561 + -0.5 x = 10.9658561 + -0.5 Combine like terms: 10.9658561 + -0.5 = 10.4658561 x = 10.4658561 Simplifying x = 10.4658561

Subproblem 2

x + 0.5 = -10.9658561 Simplifying x + 0.5 = -10.9658561 Reorder the terms: 0.5 + x = -10.9658561 Solving 0.5 + x = -10.9658561 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 = -10.9658561 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -10.9658561 + -0.5 x = -10.9658561 + -0.5 Combine like terms: -10.9658561 + -0.5 = -11.4658561 x = -11.4658561 Simplifying x = -11.4658561

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.4658561, -11.4658561}

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