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

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


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

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

Reorder the terms:
((-21xy + 3x2) + 4y * (x + -7y)) = 0
((-21xy + 3x2) + 4y * (x + -7y)) = 0
(-21xy + 3x2 + (x * 4y + -7y * 4y)) = 0
(-21xy + 3x2 + (4xy + -28y2)) = 0

Reorder the terms:
(-21xy + 4xy + 3x2 + -28y2) = 0

Combine like terms: -21xy + 4xy = -17xy
(-17xy + 3x2 + -28y2) = 0

Solving
-17xy + 3x2 + -28y2 = 0

Solving for variable 'x'.

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


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

Simplifying
x + -7y = 0

Solving
x + -7y = 0

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

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

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

Simplifying
x = 7y

Subproblem 2
Set the factor '(3x + 4y)' equal to zero and attempt to solve:

Simplifying
3x + 4y = 0

Solving
3x + 4y = 0

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

Add '-4y' to each side of the equation.
3x + 4y + -4y = 0 + -4y

Combine like terms: 4y + -4y = 0
3x + 0 = 0 + -4y
3x = 0 + -4y
Remove the zero:
3x = -4y

Divide each side by '3'.
x = -1.333333333y

Simplifying
x = -1.333333333y
Solution
x = {7y, -1.333333333y}

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