(7x-y)(x+2y)=

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Solution for (7x-y)(x+2y)= equation:


Simplifying
(7x + -1y)(x + 2y) = 0

Multiply (7x + -1y) * (x + 2y)
(7x * (x + 2y) + -1y * (x + 2y)) = 0
((x * 7x + 2y * 7x) + -1y * (x + 2y)) = 0

Reorder the terms:
((14xy + 7x2) + -1y * (x + 2y)) = 0
((14xy + 7x2) + -1y * (x + 2y)) = 0
(14xy + 7x2 + (x * -1y + 2y * -1y)) = 0
(14xy + 7x2 + (-1xy + -2y2)) = 0

Reorder the terms:
(14xy + -1xy + 7x2 + -2y2) = 0

Combine like terms: 14xy + -1xy = 13xy
(13xy + 7x2 + -2y2) = 0

Solving
13xy + 7x2 + -2y2 = 0

Solving for variable 'x'.

Factor a trinomial.
(7x + -1y)(x + 2y) = 0

Subproblem 1

Set the factor '(7x + -1y)' equal to zero and attempt to solve: Simplifying 7x + -1y = 0 Solving 7x + -1y = 0 Move all terms containing x to the left, all other terms to the right. Add 'y' to each side of the equation. 7x + -1y + y = 0 + y Combine like terms: -1y + y = 0 7x + 0 = 0 + y 7x = 0 + y Remove the zero: 7x = y Divide each side by '7'. x = 0.1428571429y Simplifying x = 0.1428571429y

Subproblem 2

Set the factor '(x + 2y)' equal to zero and attempt to solve: Simplifying x + 2y = 0 Solving x + 2y = 0 Move all terms containing x to the left, all other terms to the right. Add '-2y' to each side of the equation. x + 2y + -2y = 0 + -2y Combine like terms: 2y + -2y = 0 x + 0 = 0 + -2y x = 0 + -2y Remove the zero: x = -2y Simplifying x = -2y

Solution

x = {0.1428571429y, -2y}

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