Question

expension of (x + 3y) (x - y) gives ​

Answer 1

Answer:

(x+3y) (x-y)

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

= x²-xy +3xy -3y

= x²+2xy -3y

Answer 2

SOLUTION:

( x + 3y ) (x - y )

x(x - y) + 3y(x - y)

x² - xy + 3xy - 3y²

x² + 2xy - 3y²

x² + (3 - 1)xy - 3y²

x² + 3xy - 1xy - 3y²

x(x + 3y) - y(x + 3y)

(x - y) (x + 3y)

x - y = 0

x = y

and , x + 3y = 0

x = -3y