x^2+2.1x-1610.9=0

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Solution for x^2+2.1x-1610.9=0 equation:


Simplifying
x2 + 2.1x + -1610.9 = 0

Reorder the terms:
-1610.9 + 2.1x + x2 = 0

Solving
-1610.9 + 2.1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1610.9' to each side of the equation.
-1610.9 + 2.1x + 1610.9 + x2 = 0 + 1610.9

Reorder the terms:
-1610.9 + 1610.9 + 2.1x + x2 = 0 + 1610.9

Combine like terms: -1610.9 + 1610.9 = 0.0
0.0 + 2.1x + x2 = 0 + 1610.9
2.1x + x2 = 0 + 1610.9

Combine like terms: 0 + 1610.9 = 1610.9
2.1x + x2 = 1610.9

The x term is 2.1x.  Take half its coefficient (1.05).
Square it (1.1025) and add it to both sides.

Add '1.1025' to each side of the equation.
2.1x + 1.1025 + x2 = 1610.9 + 1.1025

Reorder the terms:
1.1025 + 2.1x + x2 = 1610.9 + 1.1025

Combine like terms: 1610.9 + 1.1025 = 1612.0025
1.1025 + 2.1x + x2 = 1612.0025

Factor a perfect square on the left side:
(x + 1.05)(x + 1.05) = 1612.0025

Calculate the square root of the right side: 40.149750933

Break this problem into two subproblems by setting 
(x + 1.05) equal to 40.149750933 and -40.149750933.

Subproblem 1

x + 1.05 = 40.149750933 Simplifying x + 1.05 = 40.149750933 Reorder the terms: 1.05 + x = 40.149750933 Solving 1.05 + x = 40.149750933 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.05' to each side of the equation. 1.05 + -1.05 + x = 40.149750933 + -1.05 Combine like terms: 1.05 + -1.05 = 0.00 0.00 + x = 40.149750933 + -1.05 x = 40.149750933 + -1.05 Combine like terms: 40.149750933 + -1.05 = 39.099750933 x = 39.099750933 Simplifying x = 39.099750933

Subproblem 2

x + 1.05 = -40.149750933 Simplifying x + 1.05 = -40.149750933 Reorder the terms: 1.05 + x = -40.149750933 Solving 1.05 + x = -40.149750933 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.05' to each side of the equation. 1.05 + -1.05 + x = -40.149750933 + -1.05 Combine like terms: 1.05 + -1.05 = 0.00 0.00 + x = -40.149750933 + -1.05 x = -40.149750933 + -1.05 Combine like terms: -40.149750933 + -1.05 = -41.199750933 x = -41.199750933 Simplifying x = -41.199750933

Solution

The solution to the problem is based on the solutions from the subproblems. x = {39.099750933, -41.199750933}

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