Factor 81+18a+a^2

Math
81+18a+a2
Rewrite 81 as 92.
92+18a+a2
Check the middle term by multiplying 2ab and compare this result with the middle term in the original expression.
2ab=2⋅9⋅a
Simplify.
2ab=18a
Factor using the perfect square trinomial rule a2+2ab+b2=(a+b)2, where a=9 and b=a.
(9+a)2
Factor 81+18a+a^2

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