Factor the polynomial. $$y ^ { 2 } + 18 y + 81$$
A) $( y + 9 ) ^ { 2 }$
B) $( 9 + y ) ( 8 - y )$
C) $( y - 9 ) ( y + 9 )$
D) $( y - 9 ) ^ { 2 }$
E)none of these

Name: Factor the polynomial. \[y ^ { 2 } + 18 y + 81\] A) $( y + 9 ) ^ { 2 }$ B) $( 9 + y ) ( 8 - y )$ C) $( y - 9 ) ( y + 9 )$ D) $( y - 9 ) ^ { 2 }$ E)none of these
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Quizplus · Accepted Answer

This polynomial is a perfect square trinomial, factoring into $(y + 9)^2$, because $9^2 = 81$ and $2 \cdot 9 \cdot y = 18y$.

Factor the Polynomial y2+18y+81y ^ { 2 } + 18 y + 81y2+18y+81

Factor the Polynomial $y ^ { 2 } + 18 y + 81$