(x^2)+2x=(660000)2

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Solution for (x^2)+2x=(660000)2 equation:


Simplifying
(x2) + 2x = (660000) * 2
x2 + 2x = (660000) * 2

Reorder the terms:
2x + x2 = (660000) * 2

Multiply 660000 * 2
2x + x2 = 1320000

Solving
2x + x2 = 1320000

Solving for variable 'x'.

Reorder the terms:
-1320000 + 2x + x2 = 1320000 + -1320000

Combine like terms: 1320000 + -1320000 = 0
-1320000 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1320000' to each side of the equation.
-1320000 + 2x + 1320000 + x2 = 0 + 1320000

Reorder the terms:
-1320000 + 1320000 + 2x + x2 = 0 + 1320000

Combine like terms: -1320000 + 1320000 = 0
0 + 2x + x2 = 0 + 1320000
2x + x2 = 0 + 1320000

Combine like terms: 0 + 1320000 = 1320000
2x + x2 = 1320000

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 1320000 + 1

Reorder the terms:
1 + 2x + x2 = 1320000 + 1

Combine like terms: 1320000 + 1 = 1320001
1 + 2x + x2 = 1320001

Factor a perfect square on the left side:
(x + 1)(x + 1) = 1320001

Calculate the square root of the right side: 1148.912964502

Break this problem into two subproblems by setting 
(x + 1) equal to 1148.912964502 and -1148.912964502.

Subproblem 1

x + 1 = 1148.912964502 Simplifying x + 1 = 1148.912964502 Reorder the terms: 1 + x = 1148.912964502 Solving 1 + x = 1148.912964502 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1148.912964502 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1148.912964502 + -1 x = 1148.912964502 + -1 Combine like terms: 1148.912964502 + -1 = 1147.912964502 x = 1147.912964502 Simplifying x = 1147.912964502

Subproblem 2

x + 1 = -1148.912964502 Simplifying x + 1 = -1148.912964502 Reorder the terms: 1 + x = -1148.912964502 Solving 1 + x = -1148.912964502 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1148.912964502 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1148.912964502 + -1 x = -1148.912964502 + -1 Combine like terms: -1148.912964502 + -1 = -1149.912964502 x = -1149.912964502 Simplifying x = -1149.912964502

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1147.912964502, -1149.912964502}

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