Question

an = 3n2 + 4n + 5 what is a20​

Answer 1

Answer:

given,

an=3n²+4n+5

then a20=?

a20=3(20)²+4(20)+5

=3*400+80+5

=1200+85

=1285 is the answer

Answer 2

Answer:

1285 is the answer

Step-by-step explanation:

sub. n=20

a20=3×20×20+4×20+5

       =1200+80+5

       =1285

so the answer is 1285

MARK ME AS BRAINLIEST