Question 1111638
.
Substitute the value of "3" instead of "x" into the formula and calculate


f(3) = 3*3 - 5.



I sincerely hope that after doing it ONE TIME after my explanation, you will learn it once for all  (for all your life)  how to solve such simple problems.


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Remember that such problems are of &nbsp;<U>LEVEL 0</U>&nbsp;  (Level ZERO), which means that every student must do them in &nbsp;1-2-3 &nbsp;seconds 

on &nbsp;his/(her)&nbsp; own without any help from the side &nbsp;(and without asking questions).