1805=x^2+2x

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Solution for 1805=x^2+2x equation:


Simplifying
1805 = x2 + 2x

Reorder the terms:
1805 = 2x + x2

Solving
1805 = 2x + x2

Solving for variable 'x'.

Reorder the terms:
1805 + -2x + -1x2 = 2x + -2x + x2 + -1x2

Combine like terms: 2x + -2x = 0
1805 + -2x + -1x2 = 0 + x2 + -1x2
1805 + -2x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
1805 + -2x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-1805 + 2x + x2 = 0

Move the constant term to the right:

Add '1805' to each side of the equation.
-1805 + 2x + 1805 + x2 = 0 + 1805

Reorder the terms:
-1805 + 1805 + 2x + x2 = 0 + 1805

Combine like terms: -1805 + 1805 = 0
0 + 2x + x2 = 0 + 1805
2x + x2 = 0 + 1805

Combine like terms: 0 + 1805 = 1805
2x + x2 = 1805

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 = 1805 + 1

Reorder the terms:
1 + 2x + x2 = 1805 + 1

Combine like terms: 1805 + 1 = 1806
1 + 2x + x2 = 1806

Factor a perfect square on the left side:
(x + 1)(x + 1) = 1806

Calculate the square root of the right side: 42.497058722

Break this problem into two subproblems by setting 
(x + 1) equal to 42.497058722 and -42.497058722.

Subproblem 1

x + 1 = 42.497058722 Simplifying x + 1 = 42.497058722 Reorder the terms: 1 + x = 42.497058722 Solving 1 + x = 42.497058722 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 = 42.497058722 + -1 Combine like terms: 1 + -1 = 0 0 + x = 42.497058722 + -1 x = 42.497058722 + -1 Combine like terms: 42.497058722 + -1 = 41.497058722 x = 41.497058722 Simplifying x = 41.497058722

Subproblem 2

x + 1 = -42.497058722 Simplifying x + 1 = -42.497058722 Reorder the terms: 1 + x = -42.497058722 Solving 1 + x = -42.497058722 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 = -42.497058722 + -1 Combine like terms: 1 + -1 = 0 0 + x = -42.497058722 + -1 x = -42.497058722 + -1 Combine like terms: -42.497058722 + -1 = -43.497058722 x = -43.497058722 Simplifying x = -43.497058722

Solution

The solution to the problem is based on the solutions from the subproblems. x = {41.497058722, -43.497058722}

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