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

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


Simplifying
(3x + y)(4x + -1y) = 0

Multiply (3x + y) * (4x + -1y)
(3x * (4x + -1y) + y(4x + -1y)) = 0
((4x * 3x + -1y * 3x) + y(4x + -1y)) = 0

Reorder the terms:
((-3xy + 12x2) + y(4x + -1y)) = 0
((-3xy + 12x2) + y(4x + -1y)) = 0
(-3xy + 12x2 + (4x * y + -1y * y)) = 0
(-3xy + 12x2 + (4xy + -1y2)) = 0

Reorder the terms:
(-3xy + 4xy + 12x2 + -1y2) = 0

Combine like terms: -3xy + 4xy = 1xy
(1xy + 12x2 + -1y2) = 0

Solving
1xy + 12x2 + -1y2 = 0

Solving for variable 'x'.

Factor a trinomial.
(4x + -1y)(3x + y) = 0


Subproblem 1
Set the factor '(4x + -1y)' equal to zero and attempt to solve:

Simplifying
4x + -1y = 0

Solving
4x + -1y = 0

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

Add 'y' to each side of the equation.
4x + -1y + y = 0 + y

Combine like terms: -1y + y = 0
4x + 0 = 0 + y
4x = 0 + y
Remove the zero:
4x = y

Divide each side by '4'.
x = 0.25y

Simplifying
x = 0.25y

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

Simplifying
3x + y = 0

Solving
3x + y = 0

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

Add '-1y' to each side of the equation.
3x + y + -1y = 0 + -1y

Combine like terms: y + -1y = 0
3x + 0 = 0 + -1y
3x = 0 + -1y
Remove the zero:
3x = -1y

Divide each side by '3'.
x = -0.3333333333y

Simplifying
x = -0.3333333333y
Solution
x = {0.25y, -0.3333333333y}

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