Question

Find the product.
(3x + y) (3x - 3y)

Answer 1

9xsq - 6xy -3ysq

Explanation:

3x x 3x = 9xsq

3x x -3y= -9xy

y x 3x = 3xy

y x -3y= -3ysq

9xsq -9xy +3xy -3ysq

9xsq -6xy - 3ysq

sq = squared

Answer 2

`9x^(2) -6xy-3y^(2)`

Explanation:

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

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

`9x^(2) -9xy+3xy-3y^(2)`

`9x^(2) -6xy-3y^(2)`