## Introductory Algebra for College Students (7th Edition)

$y^2-4y-21$
Using $(a+b)(c+d)=ab+ad+bc+bd$ or the FOIL Method, the product of the given expression, $(y-7)(y+3) ,$ is \begin{array}{l}\require{cancel} y(y)+y(3)-7(y)-7(3) \\\\= y^2+3y-7y-21 \\\\= y^2-4y-21 .\end{array}