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