z^2-18z+81-25x^2

(z-9)^2 -(5x)^2
(z-9+5x)(z-9-5x)

is this factored completely?

3 answers

where's the 18z? it's set up as multiplication.
isn't the (z-9)^2 for the 18?

not sure how to finish it then
z^2 – 18z – 37 = 0
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