Given that f(x)=x2+1x\displaystyle {f{{\left({x}\right)}}}={x}^{{2}}+{1}{x} and g(x)=x−7\displaystyle {g{{\left({x}\right)}}}={x}-{7}, calculate
(a) f∘g(x)\displaystyle {f}\circ{g{{\left({x}\right)}}}=   ,


(b) g∘f(x)\displaystyle {g}\circ{f{{\left({x}\right)}}}=   ,


(c) f∘f(x)\displaystyle {f}\circ{f{{\left({x}\right)}}}=   ,


(d) g∘g(x)\displaystyle {g}\circ{g{{\left({x}\right)}}}=   ,



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