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## Answers

(r-8)(r-2)=0;

r=2; r=8;

plot: -l----o-------------------o----

2 8;

Inequality (r-2)(r-8) <0;

r<2 ( - )( - ) =+<0 does not satisfy the inquality;

2<r<8 (+ )(-) =- <0 satisfy the inequality;

r>8 (+) (+) =+<0 does not satisfy the inequality;

solution set {r/(2<r<8)}

final graph;

----I------o/////////////////////////o--------- open interval;

2 r 8