Question

Seja a função f definida por : f(x) = 2x³ - 1 .

Então f(0) + f(-1) + f (1/2) é ?

Answer 1

Se f(x) = 2x³ - 1, temos:

f(0) = 2(0)³ - 1

f(0) = 0 - 1

f(0) = - 1

f(-1) = 2(-1)³ - 1

f(-1) = 2(-1) - 1

f(-1) = - 2 - 1

f(-1) = -3

f(1/2) = 2(1/2)³ - 1

f(1/2) = 2(1/8) - 1

f(1/2) = 2/8 - 1

f(1/2) = 1/4 - 1

f(1/2) = 1/4 - 4/4

f(1/2) = - 3/4

f(0) + f(-1) + f(1/2)

= - 1 + ( -3 ) + ( -  3/4 )

= - 1 - 3 - 3/4

= - 4/4 - 12/4 - 3/4

= - 19/4