Multiply y^2-16/2y. 5y/y-4

So, first we multiply the fraction by using the formula a/b times c/d = a times c/b times d

= (y^2-16) times 5y/2y (y-4)

Now, we cancel the common factor y

= (y^2-16) times 5/2 (y-4)

Now, we factor 5 (y^2-16)

We factor (y^2-16) first

y^2-16

Rewrite 16 as 4^2

y^2-4^2

Now, apply the formula x^2-y^2 = (x+y) (x-y)

=y^2-4^2 = (y+4) (y-4)

=5 (y+4) (y-4)

=5 (y+4) (y-4) / 2 (y-4)

Cancel the common factor y-4

=5 (y+4) / 2

Answer: 5 (y+4) / 2