Question

Let f(x)=x²+9 and h(x)=x+7
find (f•h)(-6)

Answer 1

`\mathrm{Solution:}\\\mathrm{f}(x)=x^2+9\\\mathrm{h}(x)=x+7\\\mathrm{Now,}\\\mathrm{foh}(x)=\mathrm{f}(\bold{h(x)})=[\bold{h(x)}]^2+9\\\mathrm{or,\ foh}(\bold{x})=(\bold{x}+7)^2+9\\\mathrm{Put\ }x=-6,\\\mathrm{foh}(\bold{-6})=[\bold{-6}+7]^2+9=10`