Use the functions:

 f(x)=\displaystyle {f{{\left({x}\right)}}}= x2+5x\displaystyle {x}^{{2}}+{5}{x}

g(x)=\displaystyle {g{{\left({x}\right)}}}= −7+8x2\displaystyle -{7}+{8}{x}^{{2}}

to find the following values, if they exist.

(i)  (f+g)(2)=\displaystyle {\left({f}+{g}\right)}{\left({2}\right)}=   

(ii)  (f−g)(3)=\displaystyle {\left({f}-{g}\right)}{\left({3}\right)}=   

(iii)  (f⋅g)(−8)=\displaystyle {\left({f}\cdot{g}\right)}{\left(-{8}\right)}=   

(iv)  (fg)(8)=\displaystyle {\left(\frac{{f}}{{g}}\right)}{\left({8}\right)}=   

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