Calculus
a=7,a = 7,a=7, the function is discontinuous because limx→af(x)≠f(a)\lim_{x\to a}f\left(x\right)\ne f\left(a\right)limx→af(x)=f(a); a=9,a = 9,a=9, the function is discontinuous because the limit does not exist; a=15,a=15, the function is discontinuous because f(a)f\left(a\right)f(a) is undefined where aaa is in the domain of fff
a=5,a = 5,a=5, the function is discontinuous because the limit does not existfff; a=7,a = 7,a=7, the function is discontinuous because limx→af(x)≠f(a)\lim_{x\to a}f\left(x\right)\ne f\left(a\right)limx→af(x)=f(a); a=9,a = 9,a=9, the function is discontinuous because f(a)f\left(a\right)f(a) is undefined where aaa is in the domain of fff
a=0a=0,, the function is discontinuous because f(a)f\left(a\right)f(a) is undefined where aaa is in the domain of fff; a=7,a = 7,a=7, the function is discontinuous because limx→af(x)≠f(a)\lim_{x\to a}f\left(x\right)\ne f\left(a\right)limx→af(x)=f(a); a=9,a = 9,a=9, the function is discontinuous because the limit does not exist
a=5,a = 5, the function is discontinuous because f(a)f\left(a\right) is undefined where aa is in the domain of ff; a=7,a = 7, the function is discontinuous because limx→af(x)≠f(a)\lim_{x\to a}f\left(x\right)\ne f\left(a\right)limx→af(x)=f(a); a=9,a = 9, the function is discontinuous because the limit does not exist