Question

Dada função f(x)= 3x² - 5x , determine o valor de: a) f( 2)= b) f(6)= C) f( 5)= d) f( 1)=

Answer 1

Resposta:

f(x)= 3x² - 5x

a) f(2)= 3•2² - 5•2

f(2)= 3•4 - 10

f(2)= 12-10 = 2

b) f(6)= 3x² - 5x

f(6)= 3•6² - 5•6

f(6)= 3•36 - 30

f(6)= 108 - 30 = 78

c) f(5)= 3x² - 5x

f(5)= 3•5² - 5•5

f(5)= 3•25 - 25

f(5)= 75 - 25 = 50

d) f(1)= 3x² - 5x

f(1)= 3•1² - 5•1

f(1)= 3•1 - 5

f(1)= 3 - 5

f(1)= -2