FOIL Method

From Homeworkwiki

Use FOIL method to find the product of (9x⁷-3)(x⁹-1) .

Answer :

(9x⁷-3)(x⁹-1)

Just follow the letters in FOIL:

1. 9x⁷*x⁹=9x¹⁶

2.9x⁷*(-1)=-9x⁷

3.(-3)*x⁹=-3x⁹

4.(-3)*(-1)=3

so, 9x¹⁶-9x⁷-3x⁹+3