(x)(x+1)=7920

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Solution for (x)(x+1)=7920 equation:


Simplifying
(x)(x + 1) = 7920

Reorder the terms:
x(1 + x) = 7920
(1 * x + x * x) = 7920
(1x + x2) = 7920

Solving
1x + x2 = 7920

Solving for variable 'x'.

Reorder the terms:
-7920 + 1x + x2 = 7920 + -7920

Combine like terms: 7920 + -7920 = 0
-7920 + 1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7920' to each side of the equation.
-7920 + 1x + 7920 + x2 = 0 + 7920

Reorder the terms:
-7920 + 7920 + 1x + x2 = 0 + 7920

Combine like terms: -7920 + 7920 = 0
0 + 1x + x2 = 0 + 7920
1x + x2 = 0 + 7920

Combine like terms: 0 + 7920 = 7920
1x + x2 = 7920

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 = 7920 + 0.25

Reorder the terms:
0.25 + x + x2 = 7920 + 0.25

Combine like terms: 7920 + 0.25 = 7920.25
0.25 + x + x2 = 7920.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 7920.25

Calculate the square root of the right side: 88.995786417

Break this problem into two subproblems by setting 
(x + 0.5) equal to 88.995786417 and -88.995786417.

Subproblem 1

x + 0.5 = 88.995786417 Simplifying x + 0.5 = 88.995786417 Reorder the terms: 0.5 + x = 88.995786417 Solving 0.5 + x = 88.995786417 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 = 88.995786417 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 88.995786417 + -0.5 x = 88.995786417 + -0.5 Combine like terms: 88.995786417 + -0.5 = 88.495786417 x = 88.495786417 Simplifying x = 88.495786417

Subproblem 2

x + 0.5 = -88.995786417 Simplifying x + 0.5 = -88.995786417 Reorder the terms: 0.5 + x = -88.995786417 Solving 0.5 + x = -88.995786417 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 = -88.995786417 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -88.995786417 + -0.5 x = -88.995786417 + -0.5 Combine like terms: -88.995786417 + -0.5 = -89.495786417 x = -89.495786417 Simplifying x = -89.495786417

Solution

The solution to the problem is based on the solutions from the subproblems. x = {88.495786417, -89.495786417}

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