(a) No (b) No
Work Step by Step
(a) No, $x$ does not have to be positive. For example, if we use $x=-3$: x(x+1)=(-3)(-3+1)=(-3)(-2)=6>0 (b) No, $x$ can be less than 5. For example, if we use $x=3$: x(x+1)=(3)(3+1)=3(4)=12>5
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