Answer:
Explanation:
hello :
let : f(x) this denominator :
12/x(x+4) = f(x)/x(x+4)(x-9)
f(x) =12x(x+4)(x-9)/x(x+4)
if : x(x+4)(x-9)≠0 simpify by : x(x+4)
f(x) = 12(x-9)
12(x-9)
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