21x^2-8xy-4y^2=0

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Solution for 21x^2-8xy-4y^2=0 equation:


Simplifying
21x2 + -8xy + -4y2 = 0

Reorder the terms:
-8xy + 21x2 + -4y2 = 0

Solving
-8xy + 21x2 + -4y2 = 0

Solving for variable 'x'.

Factor a trinomial.
(3x + -2y)(7x + 2y) = 0

Subproblem 1

Set the factor '(3x + -2y)' equal to zero and attempt to solve: Simplifying 3x + -2y = 0 Solving 3x + -2y = 0 Move all terms containing x to the left, all other terms to the right. Add '2y' to each side of the equation. 3x + -2y + 2y = 0 + 2y Combine like terms: -2y + 2y = 0 3x + 0 = 0 + 2y 3x = 0 + 2y Remove the zero: 3x = 2y Divide each side by '3'. x = 0.6666666667y Simplifying x = 0.6666666667y

Subproblem 2

Set the factor '(7x + 2y)' equal to zero and attempt to solve: Simplifying 7x + 2y = 0 Solving 7x + 2y = 0 Move all terms containing x to the left, all other terms to the right. Add '-2y' to each side of the equation. 7x + 2y + -2y = 0 + -2y Combine like terms: 2y + -2y = 0 7x + 0 = 0 + -2y 7x = 0 + -2y Remove the zero: 7x = -2y Divide each side by '7'. x = -0.2857142857y Simplifying x = -0.2857142857y

Solution

x = {0.6666666667y, -0.2857142857y}

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