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

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


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

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

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

Reorder the terms:
(3xy + 7xy + 21x2 + y2) = 0

Combine like terms: 3xy + 7xy = 10xy
(10xy + 21x2 + y2) = 0

Solving
10xy + 21x2 + y2 = 0

Solving for variable 'x'.

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


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

Simplifying
7x + y = 0

Solving
7x + y = 0

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

Add '-1y' to each side of the equation.
7x + y + -1y = 0 + -1y

Combine like terms: y + -1y = 0
7x + 0 = 0 + -1y
7x = 0 + -1y
Remove the zero:
7x = -1y

Divide each side by '7'.
x = -0.1428571429y

Simplifying
x = -0.1428571429y

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 = {-0.1428571429y, -0.3333333333y}

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