Question

dada a função f(x)= 3x²- 4x+1. determine.

a) f(2)

b f(-2)

c) f(h+1)​

Answer 1

Resposta:

a) $f(2)=5$

b) $f(-2)=21$

c) $f(h+1)=3h^2+2h$

Explicação passo a passo:

Basta substituir os valores passados e realizar os cálculos.

Item a:

$f(2)=3\cdot2^2-4\cdot2+1\\\\f(2)=3\cdot4-8+1\\\\f(2)=12-8+1\\\\f(2)=5$

Item b:

$f(-2)=3\cdot(-2)^2-4\cdot(-2)+1\\\\f(-2)=3\cdot4+8+1\\\\f(-2)=12+8+1\\\\f(-2)=21$

Item c:

$f(h+1)=3\cdot(h+1)^2-4\cdot(h+1)+1\\\\f(h+1)=3\cdot(h^2+2h+1)-4h-4+1\\\\f(h+1)=3h^2+6h+3-4h-3\\\\f(h+1)=3h^2+2h$