expand and simplify (p+9)(p-4)
(p + 9)(p-4)p(p -4) + 9(p -4)pp - 4p + 9p +9-4p² - 4p + 9p - 36p² + 9p -4p - 36p² +5p - 36
(p + 9)(p - 4) =FOIL:p^2 - 4p + 9p - 36 =p^2 + 5p - 36