Question

Determine o valor da função f (x) = 4x-2 para:

a) O valor de x, quando f (x) = 2
b)f (2) - f (0)

Answer 1

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

b) f(2)=4(2)-2 > 8-2 > 6
f(0)=4(0)-2 > -2
6-2=4

Answer 2

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

b) f (2) -f (0)
f (2)= 4(2) -2
f (2) = 8 -2
f (2) = 6

f (0) = 4.0 -2
f (0) = 0 -2
f (0) = -2

R= 6 - (-2)
R= 6+ 2
R= 8