x*(x+1)=168

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Solution for x*(x+1)=168 equation:


Simplifying
x(x + 1) = 168

Reorder the terms:
x(1 + x) = 168
(1 * x + x * x) = 168
(1x + x2) = 168

Solving
1x + x2 = 168

Solving for variable 'x'.

Reorder the terms:
-168 + 1x + x2 = 168 + -168

Combine like terms: 168 + -168 = 0
-168 + 1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '168' to each side of the equation.
-168 + 1x + 168 + x2 = 0 + 168

Reorder the terms:
-168 + 168 + 1x + x2 = 0 + 168

Combine like terms: -168 + 168 = 0
0 + 1x + x2 = 0 + 168
1x + x2 = 0 + 168

Combine like terms: 0 + 168 = 168
1x + x2 = 168

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 = 168 + 0.25

Reorder the terms:
0.25 + x + x2 = 168 + 0.25

Combine like terms: 168 + 0.25 = 168.25
0.25 + x + x2 = 168.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 168.25

Calculate the square root of the right side: 12.971121771

Break this problem into two subproblems by setting 
(x + 0.5) equal to 12.971121771 and -12.971121771.

Subproblem 1

x + 0.5 = 12.971121771 Simplifying x + 0.5 = 12.971121771 Reorder the terms: 0.5 + x = 12.971121771 Solving 0.5 + x = 12.971121771 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 = 12.971121771 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 12.971121771 + -0.5 x = 12.971121771 + -0.5 Combine like terms: 12.971121771 + -0.5 = 12.471121771 x = 12.471121771 Simplifying x = 12.471121771

Subproblem 2

x + 0.5 = -12.971121771 Simplifying x + 0.5 = -12.971121771 Reorder the terms: 0.5 + x = -12.971121771 Solving 0.5 + x = -12.971121771 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 = -12.971121771 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -12.971121771 + -0.5 x = -12.971121771 + -0.5 Combine like terms: -12.971121771 + -0.5 = -13.471121771 x = -13.471121771 Simplifying x = -13.471121771

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.471121771, -13.471121771}

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