4x^2+xy-21y^2=

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Solution for 4x^2+xy-21y^2= equation: 


Simplifying
4x2 + xy + -21y2 = 0

Reorder the terms:
xy + 4x2 + -21y2 = 0

Solving
xy + 4x2 + -21y2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
0.25xy + x2 + -5.25y2 = 0

Move the constant term to the right:

Add '5.25y2' to each side of the equation.
0.25xy + x2 + -5.25y2 + 5.25y2 = 0 + 5.25y2

Combine like terms: -5.25y2 + 5.25y2 = 0.00
0.25xy + x2 + 0.00 = 0 + 5.25y2
0.25xy + x2 = 0 + 5.25y2
Remove the zero:
0.25xy + x2 = 5.25y2

The x term is xy.  Take half its coefficient (0.5y).
Square it (0.25y2) and add it to both sides.

Add '0.25y2' to each side of the equation.
0.25xy + x2 + 0.25y2 = 5.25y2 + 0.25y2

Combine like terms: 5.25y2 + 0.25y2 = 5.5y2
0.25xy + x2 + 0.25y2 = 5.5y2

Factor a perfect square on the left side:
(x + 0.5y)(x + 0.5y) = 5.5y2

Calculate the square root of the right side: 2.34520788y

Break this problem into two subproblems by setting 
(x + 0.5y) equal to 2.34520788y and -2.34520788y.


Subproblem 1
x + 0.5y = 2.34520788y

Simplifying
x + 0.5y = 2.34520788y

Solving
x + 0.5y = 2.34520788y

Solving for variable 'x'.

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

Add '-0.5y' to each side of the equation.
x + 0.5y + -0.5y = 2.34520788y + -0.5y

Combine like terms: 0.5y + -0.5y = 0.0
x + 0.0 = 2.34520788y + -0.5y
x = 2.34520788y + -0.5y

Combine like terms: 2.34520788y + -0.5y = 1.84520788y
x = 1.84520788y

Simplifying
x = 1.84520788y


Subproblem 2
x + 0.5y = -2.34520788y

Simplifying
x + 0.5y = -2.34520788y

Solving
x + 0.5y = -2.34520788y

Solving for variable 'x'.

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

Add '-0.5y' to each side of the equation.
x + 0.5y + -0.5y = -2.34520788y + -0.5y

Combine like terms: 0.5y + -0.5y = 0.0
x + 0.0 = -2.34520788y + -0.5y
x = -2.34520788y + -0.5y

Combine like terms: -2.34520788y + -0.5y = -2.84520788y
x = -2.84520788y

Simplifying
x = -2.84520788y


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.84520788y, -2.84520788y}

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