Question

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Dada à função f (x) = 1/2x + 2/5 determine :

A) f (2)

B) f (2/5)

Answer 1

f(2)=  1/2 (2)  + 2/5=  1 +2/5=  7/5

f(2/5)= 1/2 x 2/5  +2/5=2/10 + 2/5 agora temos  que tirar o mmc de  10 e 5  que é o 10

2/10+4/10=6/10= 3/5

Answer 2

f(x) = 1/2x + 2/5

mmc = 10

f(x) = (5x + 4)/10

a) f(2) = (5.2 + 4)/10 = (10 + 4)/10 = 14/10 = 7/5

b) f(2/5) = (5.2/5 + 4)/10 = (2 + 4)/10 = 6/10 = 3/5

Espero ter ajudado