Answer:
[tex] \huge \boxed{f(15) = 152 }[/tex]
Step-by-step explanation:
[tex]f(x) = 15 {x}^{2} - x + 20[/tex]
To find f(3) , substitute the value of x that's 3 into f(x). That is for every x in f(x) replace it with 3.
We have
[tex]f(15) = 15( {3})^{2} - 3 + 20 \\ \: \: = 15(9) + 17 \\ = 135 + 17 \: \\ = 152 \: \: \: \: \: \: \: \: \: \: [/tex]
We have the final answer as
[tex]f(15) = 152 [/tex]
Hope this helps you
