3x^2y+39xy-87y=

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Solution for 3x^2y+39xy-87y= equation: 


Simplifying
3x2y + 39xy + -87y = 0

Reorder the terms:
39xy + 3x2y + -87y = 0

Solving
39xy + 3x2y + -87y = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3y'.
3y(13x + x2 + -29) = 0

Ignore the factor 3.

Subproblem 1
Set the factor 'y' equal to zero and attempt to solve:

Simplifying
y = 0

Solving
y = 0

Move all terms containing x to the left, all other terms to the right.

Add '-1y' to each side of the equation.
y + -1y = 0 + -1y
Remove the zero:
0 = -1y

Simplifying
0 = -1y

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.

Subproblem 2
Set the factor '(13x + x2 + -29)' equal to zero and attempt to solve:

Simplifying
13x + x2 + -29 = 0

Reorder the terms:
-29 + 13x + x2 = 0

Solving
-29 + 13x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '29' to each side of the equation.
-29 + 13x + 29 + x2 = 0 + 29

Reorder the terms:
-29 + 29 + 13x + x2 = 0 + 29

Combine like terms: -29 + 29 = 0
0 + 13x + x2 = 0 + 29
13x + x2 = 0 + 29

Combine like terms: 0 + 29 = 29
13x + x2 = 29

The x term is 13x.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13x + 42.25 + x2 = 29 + 42.25

Reorder the terms:
42.25 + 13x + x2 = 29 + 42.25

Combine like terms: 29 + 42.25 = 71.25
42.25 + 13x + x2 = 71.25

Factor a perfect square on the left side:
(x + 6.5)(x + 6.5) = 71.25

Calculate the square root of the right side: 8.440971508

Break this problem into two subproblems by setting 
(x + 6.5) equal to 8.440971508 and -8.440971508.


Subproblem 1
x + 6.5 = 8.440971508

Simplifying
x + 6.5 = 8.440971508

Reorder the terms:
6.5 + x = 8.440971508

Solving
6.5 + x = 8.440971508

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-6.5' to each side of the equation.
6.5 + -6.5 + x = 8.440971508 + -6.5

Combine like terms: 6.5 + -6.5 = 0.0
0.0 + x = 8.440971508 + -6.5
x = 8.440971508 + -6.5

Combine like terms: 8.440971508 + -6.5 = 1.940971508
x = 1.940971508

Simplifying
x = 1.940971508


Subproblem 2
x + 6.5 = -8.440971508

Simplifying
x + 6.5 = -8.440971508

Reorder the terms:
6.5 + x = -8.440971508

Solving
6.5 + x = -8.440971508

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-6.5' to each side of the equation.
6.5 + -6.5 + x = -8.440971508 + -6.5

Combine like terms: 6.5 + -6.5 = 0.0
0.0 + x = -8.440971508 + -6.5
x = -8.440971508 + -6.5

Combine like terms: -8.440971508 + -6.5 = -14.940971508
x = -14.940971508

Simplifying
x = -14.940971508


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.940971508, -14.940971508}
Solution
x = {1.940971508, -14.940971508}

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