Question 791771
{{{f(x) = 15x^3 + 13x^2 - 15x + 15}}}
{{{g(x) = 15x + 11}}}
find {{{g(f(9))}}} 

first calculate {{{f(9)}}}, then calculate the value of {{{g}}} at the value of {{{f(9)}}}:



{{{f(9) = 15*9^3 + 13*9^2 - 15*9 + 15}}}

{{{f(9) = 15*729 + 13*81 - 15*9 + 15}}}

{{{f(9) = 10935 + 1053 - 135 + 15}}}

{{{f(9) = 11868}}}

{{{g(f(9)) = 15*11868 + 11}}}
{{{g(f(9)) = 178020+ 11}}}
{{{g(f(9)) = 178031}}}

so, your answer is: {{{E}}}{{{ 178031}}}