Question

Dadas as funções f(x) = 2x – 3 e g(x) = x2 – 2, determine o
valor de:
a) f(2) b) f(-1) c) g(-4) d) g(2) e) f(-3).g(-3) f) g(0)​

Answer 1

Resposta:

a)f(2)= 1

b)f(-1) = -5

c)g(-4)= 14

d)g(2) =2

e) f(-3).g(-3) = -63

f)g(0) = -2

Explicação passo-a-passo:

a)f(x) = 2x – 3

  f(2) = 2.2-3

 f(2)= 4- 3 => 1

b)f(x) = 2x – 3

  f(-1) = 2.-1 -3

 f(-1) = -2 -2 => -5

c)g(x) = x² – 2

  g(-4)= -4² -2

  g(-4) =16 -2 => 14

d)g(x) = x² – 2

  g(2) = 2²-2

  g(2) = 4-2 => 2

e)f(x) = 2x – 3 .   g(x) = x2 – 2

(2x-3).( x² – 2)

(2.-3-3). (-3²-2)

(-6-3). (9-2)

-9 .7 = -63

f)g(x) = x2 – 2

 g(0) = 0² -2

 g(0) = 0-2 => -2