Factor 4z^2+20z+25

Rewrite 4z2 as (2z)2.
Rewrite 25 as 52.
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=2z and b=5.
Factor 4z^2+20z+25

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