Question

Dada a função f(x)=5-I-2x+1I, calcule: f(-3), f(0), e f(1) e indique, respectivamente, a alternativa correta: *

a) 2; -4 e 0.
b) -2; 4 e 1.
c) -2; -4 e - 1.
d) -2; 4 e 4.​

Answer 1

$\sf f(x)=5-|-2x+1|$

• $\sf f(-3)=5-|-2\cdot(-3)+1|$

$\sf f(-3)=5-|6+1|$

$\sf f(-3)=5-|7|$

$\sf f(-3)=5-7$

$\sf f(-3)=-2$

• $\sf f(0)=5-|-2\cdot0+1|$

$\sf f(0)=5-|0+1|$

$\sf f(0)=5-|1|$

$\sf f(0)=5-1$

$\sf f(0)=4$

• $\sf f(1)=5-|-2\cdot1+1|$

$\sf f(1)=5-|-2+1|$

$\sf f(1)=5-|-1|$

$\sf f(1)=5-1$

$\sf f(1)=4$

Letra D