SOLUTION: multiply (9x+3)*(7x^2+2x+1)

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Question 368812: multiply
(9x+3)*(7x^2+2x+1)

Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
We employ a "round-robin" technique...that is, every term on the first factor multiplies every term in the second factor...then we add them up...so
%289x%2B3%29%2A%287x%5E2%2B2x%2B1%29=
63x%5E3+%2B+18x%5E2+%2B+9x+%2B+21x%5E2+%2B+6x+%2B+3=
now collect like terms and get
63x%5E3+%2B+39x%5E2+%2B+15x+%2B+3