Question

Dada a função quadrática f(x)= 2x - 2x + 4 determine:

a) f ( -1 ) =

b) f ( 2 ) =

c) f ( 2/3 ) =

Answer 1

a f=-1

b f=-2

c f=-2 e -3

Answer 2

f(x) = 2x - 2x + 4
a) f(-1)

f(-1) = 2(-1) - 2(-1) + 4
f(-1) = -2 - (-2) + 4
f(-1) = 2 + 2 + 4
f(-1) = 0 + 4
f(-1) = 4

b) f( 2 )
f(2) = 2 (2) - 2(2) + 4
f(2) = 4 - 4 + 4
f(2) = 0 + 4
f(2) = 4

c) f(2/3)
f(2/3) = 2(2/3) - 2 (2/3) + 4
f(2/3) = 4/3 - 4/3 + 4
f(2/3) = 0 + 4
f (2/3) = 4