x(x+1)=1320

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Solution for x(x+1)=1320 equation:


Simplifying
x(x + 1) = 1320

Reorder the terms:
x(1 + x) = 1320
(1 * x + x * x) = 1320
(1x + x2) = 1320

Solving
1x + x2 = 1320

Solving for variable 'x'.

Reorder the terms:
-1320 + 1x + x2 = 1320 + -1320

Combine like terms: 1320 + -1320 = 0
-1320 + 1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1320' to each side of the equation.
-1320 + 1x + 1320 + x2 = 0 + 1320

Reorder the terms:
-1320 + 1320 + 1x + x2 = 0 + 1320

Combine like terms: -1320 + 1320 = 0
0 + 1x + x2 = 0 + 1320
1x + x2 = 0 + 1320

Combine like terms: 0 + 1320 = 1320
1x + x2 = 1320

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 = 1320 + 0.25

Reorder the terms:
0.25 + x + x2 = 1320 + 0.25

Combine like terms: 1320 + 0.25 = 1320.25
0.25 + x + x2 = 1320.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 1320.25

Calculate the square root of the right side: 36.335244598

Break this problem into two subproblems by setting 
(x + 0.5) equal to 36.335244598 and -36.335244598.

Subproblem 1

x + 0.5 = 36.335244598 Simplifying x + 0.5 = 36.335244598 Reorder the terms: 0.5 + x = 36.335244598 Solving 0.5 + x = 36.335244598 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 = 36.335244598 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 36.335244598 + -0.5 x = 36.335244598 + -0.5 Combine like terms: 36.335244598 + -0.5 = 35.835244598 x = 35.835244598 Simplifying x = 35.835244598

Subproblem 2

x + 0.5 = -36.335244598 Simplifying x + 0.5 = -36.335244598 Reorder the terms: 0.5 + x = -36.335244598 Solving 0.5 + x = -36.335244598 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 = -36.335244598 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -36.335244598 + -0.5 x = -36.335244598 + -0.5 Combine like terms: -36.335244598 + -0.5 = -36.835244598 x = -36.835244598 Simplifying x = -36.835244598

Solution

The solution to the problem is based on the solutions from the subproblems. x = {35.835244598, -36.835244598}

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