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I can't remember how to do this. I need help with this.

How many roots do the functions have in common?
f(x)=x^2-9

f and g share same roots?
f and g share one root in common but each have another root not shared?
f and g share no roots in common​

I cant remember how to do this I need help with thisHow many roots do the functions have in commonfxx29f and g share same rootsf and g share one root in common class=

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