x^2-3x-1440=0

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Solution for x^2-3x-1440=0 equation:


Simplifying
x2 + -3x + -1440 = 0

Reorder the terms:
-1440 + -3x + x2 = 0

Solving
-1440 + -3x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1440' to each side of the equation.
-1440 + -3x + 1440 + x2 = 0 + 1440

Reorder the terms:
-1440 + 1440 + -3x + x2 = 0 + 1440

Combine like terms: -1440 + 1440 = 0
0 + -3x + x2 = 0 + 1440
-3x + x2 = 0 + 1440

Combine like terms: 0 + 1440 = 1440
-3x + x2 = 1440

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 = 1440 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 1440 + 2.25

Combine like terms: 1440 + 2.25 = 1442.25
2.25 + -3x + x2 = 1442.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 1442.25

Calculate the square root of the right side: 37.976966704

Break this problem into two subproblems by setting 
(x + -1.5) equal to 37.976966704 and -37.976966704.

Subproblem 1

x + -1.5 = 37.976966704 Simplifying x + -1.5 = 37.976966704 Reorder the terms: -1.5 + x = 37.976966704 Solving -1.5 + x = 37.976966704 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 = 37.976966704 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 37.976966704 + 1.5 x = 37.976966704 + 1.5 Combine like terms: 37.976966704 + 1.5 = 39.476966704 x = 39.476966704 Simplifying x = 39.476966704

Subproblem 2

x + -1.5 = -37.976966704 Simplifying x + -1.5 = -37.976966704 Reorder the terms: -1.5 + x = -37.976966704 Solving -1.5 + x = -37.976966704 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 = -37.976966704 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -37.976966704 + 1.5 x = -37.976966704 + 1.5 Combine like terms: -37.976966704 + 1.5 = -36.476966704 x = -36.476966704 Simplifying x = -36.476966704

Solution

The solution to the problem is based on the solutions from the subproblems. x = {39.476966704, -36.476966704}

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