Question

dada a função f(x) = -3×, qual das alternativas representa f( 1 ) f(-1)?
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Answer 1

$f(x)=-3^x$ calculando f(1) e f(-1)

f(1):

$f(1)=-3^1=-3$

f(-1):

$f(-1)=-3^{-1}=-\dfrac{1}{3}$

agora f(1)-f(-1)

$f(1)-f(-1)=-3-\left(-\dfrac{1}{3}\right)=-\dfrac{8}{3}$