(x-2y)(7x+4y)=

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Solution for (x-2y)(7x+4y)= equation: 


Simplifying
(x + -2y)(7x + 4y) = 0

Multiply (x + -2y) * (7x + 4y)
(x(7x + 4y) + -2y * (7x + 4y)) = 0
((7x * x + 4y * x) + -2y * (7x + 4y)) = 0

Reorder the terms:
((4xy + 7x2) + -2y * (7x + 4y)) = 0
((4xy + 7x2) + -2y * (7x + 4y)) = 0
(4xy + 7x2 + (7x * -2y + 4y * -2y)) = 0
(4xy + 7x2 + (-14xy + -8y2)) = 0

Reorder the terms:
(4xy + -14xy + 7x2 + -8y2) = 0

Combine like terms: 4xy + -14xy = -10xy
(-10xy + 7x2 + -8y2) = 0

Solving
-10xy + 7x2 + -8y2 = 0

Solving for variable 'x'.

Factor a trinomial.
(x + -2y)(7x + 4y) = 0


Subproblem 1
Set the factor '(x + -2y)' equal to zero and attempt to solve:

Simplifying
x + -2y = 0

Solving
x + -2y = 0

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

Add '2y' to each side of the equation.
x + -2y + 2y = 0 + 2y

Combine like terms: -2y + 2y = 0
x + 0 = 0 + 2y
x = 0 + 2y
Remove the zero:
x = 2y

Simplifying
x = 2y

Subproblem 2
Set the factor '(7x + 4y)' equal to zero and attempt to solve:

Simplifying
7x + 4y = 0

Solving
7x + 4y = 0

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

Add '-4y' to each side of the equation.
7x + 4y + -4y = 0 + -4y

Combine like terms: 4y + -4y = 0
7x + 0 = 0 + -4y
7x = 0 + -4y
Remove the zero:
7x = -4y

Divide each side by '7'.
x = -0.5714285714y

Simplifying
x = -0.5714285714y
Solution
x = {2y, -0.5714285714y}

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