0=x^2+2x-1900

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Solution for 0=x^2+2x-1900 equation:


Simplifying
0 = x2 + 2x + -1900

Reorder the terms:
0 = -1900 + 2x + x2

Solving
0 = -1900 + 2x + x2

Solving for variable 'x'.

Combine like terms: 0 + 1900 = 1900
1900 + -2x + -1x2 = -1900 + 2x + x2 + 1900 + -2x + -1x2

Reorder the terms:
1900 + -2x + -1x2 = -1900 + 1900 + 2x + -2x + x2 + -1x2

Combine like terms: -1900 + 1900 = 0
1900 + -2x + -1x2 = 0 + 2x + -2x + x2 + -1x2
1900 + -2x + -1x2 = 2x + -2x + x2 + -1x2

Combine like terms: 2x + -2x = 0
1900 + -2x + -1x2 = 0 + x2 + -1x2
1900 + -2x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
1900 + -2x + -1x2 = 0

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

Divide each side by '-1'.
-1900 + 2x + x2 = 0

Move the constant term to the right:

Add '1900' to each side of the equation.
-1900 + 2x + 1900 + x2 = 0 + 1900

Reorder the terms:
-1900 + 1900 + 2x + x2 = 0 + 1900

Combine like terms: -1900 + 1900 = 0
0 + 2x + x2 = 0 + 1900
2x + x2 = 0 + 1900

Combine like terms: 0 + 1900 = 1900
2x + x2 = 1900

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 = 1900 + 1

Reorder the terms:
1 + 2x + x2 = 1900 + 1

Combine like terms: 1900 + 1 = 1901
1 + 2x + x2 = 1901

Factor a perfect square on the left side:
(x + 1)(x + 1) = 1901

Calculate the square root of the right side: 43.600458713

Break this problem into two subproblems by setting 
(x + 1) equal to 43.600458713 and -43.600458713.

Subproblem 1

x + 1 = 43.600458713 Simplifying x + 1 = 43.600458713 Reorder the terms: 1 + x = 43.600458713 Solving 1 + x = 43.600458713 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 = 43.600458713 + -1 Combine like terms: 1 + -1 = 0 0 + x = 43.600458713 + -1 x = 43.600458713 + -1 Combine like terms: 43.600458713 + -1 = 42.600458713 x = 42.600458713 Simplifying x = 42.600458713

Subproblem 2

x + 1 = -43.600458713 Simplifying x + 1 = -43.600458713 Reorder the terms: 1 + x = -43.600458713 Solving 1 + x = -43.600458713 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 = -43.600458713 + -1 Combine like terms: 1 + -1 = 0 0 + x = -43.600458713 + -1 x = -43.600458713 + -1 Combine like terms: -43.600458713 + -1 = -44.600458713 x = -44.600458713 Simplifying x = -44.600458713

Solution

The solution to the problem is based on the solutions from the subproblems. x = {42.600458713, -44.600458713}

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