Question

2. Dada a função f (x) = 2x − 3, obtenha:
a) f (3)
b) f (−4)
c) o valor de x tal que f (x) = 49
d) o valor de x tal que f (x) = −10
3. Dada a função f (x) = x2, obtenha:
a) f (x0)
b) f (x0 + h)
c) f (x0 + h) − f (x0)

Answer 1

Resposta:

a) f(3)=2.3(-3)=3

b) f(-4)=2.(-4)-3= -11

c)49=2x-3

49+3=2x

52/2=x

x=26

f(26)=2.26(-3)=52-3=49

d)-10=2x-3

(-10+3)/2=x

x=-7/2

x=-3,5

f(-3,5)=2.(-3,5)-3=-7-3=-10