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It depends on the value of x, provided x is not 9, in which case the fraction is not defined.
Divide all terms by 3 and so x2+18x+81= (x+9)(x+9) when factored
Do you mean f(x) = x9 ? It would look something like this: ..........................|............. ..........................|............. .........................|.............. ................____/............... .............../........................ ..............|......................... .............|.......................... .............|..........................
x9/x2 = x9-2 = x7
9 and 10 9 x9 =81 10 x 10 = 100
72 square feet (8 x 9 = 72).