Anything above 2.
It isn't 2 because 3x2=6+1=7, and we need a number greater than 7.
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hope it helps
You only need to consider when the numerator is 0
4x^2-36x=x (4x-36)
x=0 only. vertical asymptote at x=9
The square root 121/49 is 847
No, the sum of the lengths of any two sides must be greater than the length of the third side
