Question

How do you multiply this? (y+5) (y-1)

Answer 1

do you know distributive property?

Answer 2

yes

Answer 3

then change this into \[y(y+1) + 5(y+1)\] use distributive on both terms

Answer 4

that should be y-1 but you get the point ;)

Answer 5

(y+5)(y-1)=
y^2-1y+5y-5=
=y^2+4y-5

Answer 6

thank you

Answer 7

you can use the FOIL method.
this site might help you understand this better: http://www.algebrahelp.com/lessons/simplifying/foilmethod/