x^2-3x-1680=0

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Solution for x^2-3x-1680=0 equation:


Simplifying
x2 + -3x + -1680 = 0

Reorder the terms:
-1680 + -3x + x2 = 0

Solving
-1680 + -3x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1680' to each side of the equation.
-1680 + -3x + 1680 + x2 = 0 + 1680

Reorder the terms:
-1680 + 1680 + -3x + x2 = 0 + 1680

Combine like terms: -1680 + 1680 = 0
0 + -3x + x2 = 0 + 1680
-3x + x2 = 0 + 1680

Combine like terms: 0 + 1680 = 1680
-3x + x2 = 1680

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 1680 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 1680 + 2.25

Combine like terms: 1680 + 2.25 = 1682.25
2.25 + -3x + x2 = 1682.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 1682.25

Calculate the square root of the right side: 41.01524107

Break this problem into two subproblems by setting 
(x + -1.5) equal to 41.01524107 and -41.01524107.

Subproblem 1

x + -1.5 = 41.01524107 Simplifying x + -1.5 = 41.01524107 Reorder the terms: -1.5 + x = 41.01524107 Solving -1.5 + x = 41.01524107 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 41.01524107 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 41.01524107 + 1.5 x = 41.01524107 + 1.5 Combine like terms: 41.01524107 + 1.5 = 42.51524107 x = 42.51524107 Simplifying x = 42.51524107

Subproblem 2

x + -1.5 = -41.01524107 Simplifying x + -1.5 = -41.01524107 Reorder the terms: -1.5 + x = -41.01524107 Solving -1.5 + x = -41.01524107 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -41.01524107 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -41.01524107 + 1.5 x = -41.01524107 + 1.5 Combine like terms: -41.01524107 + 1.5 = -39.51524107 x = -39.51524107 Simplifying x = -39.51524107

Solution

The solution to the problem is based on the solutions from the subproblems. x = {42.51524107, -39.51524107}

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