The answer would be y^2+10y+9.
Just remember FOIL. First, Outer, Inner, Last. You'll get y*y+9y+1y+9*1 which simplifies to y^2+10y+9.
Just remember FOIL. First, Outer, Inner, Last. You'll get y*y+9y+1y+9*1 which simplifies to y^2+10y+9.
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foil method:
(y+1)*(y+9)
= y^2 + 9y + 1y + 9
= y^2 +10y +9
(y+1)*(y+9)
= y^2 + 9y + 1y + 9
= y^2 +10y +9
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y² +10y+9