Factor 81a^2-72a+16

Rewrite 81a2 as (9a)2.
Rewrite 16 as 42.
Check that the middle term is two times the product of the numbers being squared in the first term and third term.
Rewrite the polynomial.
Factor using the perfect square trinomial rule a2-2ab+b2=(a-b)2, where a=9a and b=4.
Factor 81a^2-72a+16

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