Question

dada a função f(x) = x² - 2x - 3. Determine as imagens:

 

a) f (2)

b) f (-2)

c) f (0)

d) f (1/2)

 

Answer 1

a) $<var>2^{2}</var>$-2.2 - 3 = 4 - 4 - 3 = -3

b) $(-<var>2)^{2}</var>$- 2. (-2) - 3= 4 + 4 - 3= 5
c)$<var>0^{2}</var>$  - 2.0 - 3 = 0-0-3 = -3
d) [$1/<var>2^{2}</var>$- 2. 1/2 - 3 = 1/4 - 1 - 3 = 1/4 - 4 = -15/4