Question

Se f(x) = x² + 2x + 5, o valor de f(f(1)) é:

Answer 1

Resposta:

85

Explicação passo-a-passo:

Calculando primeiro f(1):

$f(x)=x^2+2x+5\\\\f(1)=1^2+2(1)+5\\\\f(1)=1+2+5\\\\f(1)=8$

Calculando agora f(f(1)):

$f(x)=x^2+2x+5\\\\f(f(1))=f(1)^2+2(f(1))+5\\\\f(f(1))=8^2+2(8)+5\\\\f(f(1))=64+16+5\\\\f(f(1))=85$

Valeu!