Question

Determine o valor da função afim f (x)= 5x- 3 para:a) x= 1 b) x=3/5 c) x=0 d) x= a+1 e) f (x)= -3 f) f (x)=0

Answer 1

f (x)= 5x- 3
a) x= 1 
f (1)= 5(1)- 3=2
b) x=3/5
f(3/5)=5(3/5)-3=3-3=0
c)x=0
f(0)=5(0)-3=-3
d) x= a+1 
f(a+1)=5(a+1)-3=5a+5-3=5a+2
e)f (x)= -3
f (x)= 5x- 3=-3==>5x=0==> x=0 (igual ao item c))
f) f (x)=0
f (x)= 5x- 3=0==>x=3/5 (igual ao item b))