x^2+3x-1200=0

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Solution for x^2+3x-1200=0 equation:


Simplifying
x2 + 3x + -1200 = 0

Reorder the terms:
-1200 + 3x + x2 = 0

Solving
-1200 + 3x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1200' to each side of the equation.
-1200 + 3x + 1200 + x2 = 0 + 1200

Reorder the terms:
-1200 + 1200 + 3x + x2 = 0 + 1200

Combine like terms: -1200 + 1200 = 0
0 + 3x + x2 = 0 + 1200
3x + x2 = 0 + 1200

Combine like terms: 0 + 1200 = 1200
3x + x2 = 1200

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 = 1200 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 1200 + 2.25

Combine like terms: 1200 + 2.25 = 1202.25
2.25 + 3x + x2 = 1202.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 1202.25

Calculate the square root of the right side: 34.673476895

Break this problem into two subproblems by setting 
(x + 1.5) equal to 34.673476895 and -34.673476895.

Subproblem 1

x + 1.5 = 34.673476895 Simplifying x + 1.5 = 34.673476895 Reorder the terms: 1.5 + x = 34.673476895 Solving 1.5 + x = 34.673476895 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 = 34.673476895 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 34.673476895 + -1.5 x = 34.673476895 + -1.5 Combine like terms: 34.673476895 + -1.5 = 33.173476895 x = 33.173476895 Simplifying x = 33.173476895

Subproblem 2

x + 1.5 = -34.673476895 Simplifying x + 1.5 = -34.673476895 Reorder the terms: 1.5 + x = -34.673476895 Solving 1.5 + x = -34.673476895 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 = -34.673476895 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -34.673476895 + -1.5 x = -34.673476895 + -1.5 Combine like terms: -34.673476895 + -1.5 = -36.173476895 x = -36.173476895 Simplifying x = -36.173476895

Solution

The solution to the problem is based on the solutions from the subproblems. x = {33.173476895, -36.173476895}

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