The value of function f(6) is 57.
Given
Function; [tex]\rm f(x)=x^2+5x-9[/tex]
To find the value of f(6) when the value of x =6 substitute the value in the equation then simplify the equation.
Therefore,
The value of f(6) is;
[tex]\rm f(x)=x^2+5x-9\\\\x=6\\\\f(6)=(6)^2+5(6)-9\\\\f(6)=36+30-9\\\\f(6)=66-9\\\\f(6)=57[/tex]
Hence, the required value of function f(6) is 57.
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