Question

7) As funções reais fe g são definidas por f(x) = 2x + 5 e g(x) = x2 + 1. O valor de g(f(2)) é:
a) 80
b) 15
c) 9
d) 5
e) 8​

Answer 1

$f(x)=2x+5\\\\g(x)=x^2+1\\\\g(f(x))=(2x+5)^2+1\\\\g(f(x))=4x^2+20x+25+1\\\\g(f(x))=4x^2+20x+26\\\\g(f(2))=4.2^2+20.2+26\\\\g(f(2))=16+40+26\\\\g(f(2))=82$

Nenhuma das alternativas do gabarito