if ( f(x) = 2x^{2}+1 ), what is ( f(x) ) when ( x = 3 )?\n1\n7\n13\n19

Explanation:

Step1: Substitute (x = 3) into the function

Given (f(x)=2x^{2}+1), when (x = 3), we have (f(3)=2\times(3)^{2}+1).

Step2: Calculate the value of ((3)^{2})

((3)^{2}=3\times3 = 9). So (f(3)=2\times9+1).

Step3: Calculate (2\times9)

(2\times9 = 18). Then (f(3)=18 + 1).

Step4: Calculate the final sum

(18+1=19).

Answer:

19