(7x-3y)(x+4y)=

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Solution for (7x-3y)(x+4y)= equation: 


Simplifying
(7x + -3y)(x + 4y) = 0

Multiply (7x + -3y) * (x + 4y)
(7x * (x + 4y) + -3y * (x + 4y)) = 0
((x * 7x + 4y * 7x) + -3y * (x + 4y)) = 0

Reorder the terms:
((28xy + 7x2) + -3y * (x + 4y)) = 0
((28xy + 7x2) + -3y * (x + 4y)) = 0
(28xy + 7x2 + (x * -3y + 4y * -3y)) = 0
(28xy + 7x2 + (-3xy + -12y2)) = 0

Reorder the terms:
(28xy + -3xy + 7x2 + -12y2) = 0

Combine like terms: 28xy + -3xy = 25xy
(25xy + 7x2 + -12y2) = 0

Solving
25xy + 7x2 + -12y2 = 0

Solving for variable 'x'.

Factor a trinomial.
(7x + -3y)(x + 4y) = 0


Subproblem 1
Set the factor '(7x + -3y)' equal to zero and attempt to solve:

Simplifying
7x + -3y = 0

Solving
7x + -3y = 0

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

Add '3y' to each side of the equation.
7x + -3y + 3y = 0 + 3y

Combine like terms: -3y + 3y = 0
7x + 0 = 0 + 3y
7x = 0 + 3y
Remove the zero:
7x = 3y

Divide each side by '7'.
x = 0.4285714286y

Simplifying
x = 0.4285714286y

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

Simplifying
x + 4y = 0

Solving
x + 4y = 0

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

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

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

Simplifying
x = -4y
Solution
x = {0.4285714286y, -4y}

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