Question

Dada a função primeiro grau f(X) = 2x + 3, calcule: a) f(1)= b) f(-1)= c) f(5)=

Answer 1

f(x) = 2x + 3

a) x = 1

f(1) = 2.1 + 3 = 2 + 3 = 5

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b) x = - 1

f(-1) = 2.(-1) + 3 = - 2 + 3 = 1

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
c) x = 5

f(5) = 2.5 + 3 = 10 + 3 = 13