how to figure out answer

Question

i dont know how to multiply polynomial and show work  

(9x+5)(3x-6)

Answer 1

You can use the FOIL method to expand a polynomial by multiplying two binomials.

FOIL:    

   F = First terms   ==>   multiply the first terms in each set of parentheses

   O = outer terms   ==>   multiply the outer terms in the two sets of parentheses 

   I = Inner terms   ==>   multiply the inner terms in the two sets of parentheses

   L = Last terms   ==>   multiply the last terms in each set of parentheses

     (9x + 5)(3x - 6)

     9x*3x  +  9x*-6  +  5*3x  +  5*-6

     27x²   +  -54x  +  15x  +  -30

     27x²  -  54x  +  15x  -  30

     27x²  +  -39x  - 30

     27x²  -  39x  -  30