Question: 13. Multiply, using special product methods. [ ( xy+ 7 )8 ] 2 xy +78 2 2 ( xy 1) 2 xy 2 xy+1 14.

13. Multiply, using special product methods. [ ( xy+ 7 )8 ] 2 xy +78 2 2 ( xy 1) 2 xy 2 xy+1 14. Multiply the following. (3 x+1)(3 x1)(5 y+ 6 x ) (9 x 21)(5 y+ 6 x) 2 3 45 x y +54 x 5 y 6 x 16. Factor out the greatest common factor from the following polynomial. 3 2 20 b +5 b + 4 1(20 b3 +5 b2 +4) 20. Factor the trinomial, or state the trinomial is prime. Check the factorization using FOIL multiplication. y 210 y +21 ( y 7)( y3) y 23 y7 y +21 2 y 10 y +21

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