(5x+7y)(3x-4y)=

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Solution for (5x+7y)(3x-4y)= equation: 


Simplifying
(5x + 7y)(3x + -4y) = 0

Multiply (5x + 7y) * (3x + -4y)
(5x * (3x + -4y) + 7y * (3x + -4y)) = 0
((3x * 5x + -4y * 5x) + 7y * (3x + -4y)) = 0

Reorder the terms:
((-20xy + 15x2) + 7y * (3x + -4y)) = 0
((-20xy + 15x2) + 7y * (3x + -4y)) = 0
(-20xy + 15x2 + (3x * 7y + -4y * 7y)) = 0
(-20xy + 15x2 + (21xy + -28y2)) = 0

Reorder the terms:
(-20xy + 21xy + 15x2 + -28y2) = 0

Combine like terms: -20xy + 21xy = 1xy
(1xy + 15x2 + -28y2) = 0

Solving
1xy + 15x2 + -28y2 = 0

Solving for variable 'x'.

Factor a trinomial.
(3x + -4y)(5x + 7y) = 0


Subproblem 1
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

Subproblem 2
Set the factor '(5x + 7y)' equal to zero and attempt to solve:

Simplifying
5x + 7y = 0

Solving
5x + 7y = 0

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

Add '-7y' to each side of the equation.
5x + 7y + -7y = 0 + -7y

Combine like terms: 7y + -7y = 0
5x + 0 = 0 + -7y
5x = 0 + -7y
Remove the zero:
5x = -7y

Divide each side by '5'.
x = -1.4y

Simplifying
x = -1.4y
Solution
x = {1.333333333y, -1.4y}

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