Question

dada a função f(x)= 4x + 5 calcule : a) f(-1) b) 1/4 c) f(48)

Answer 1

f(x)= 4x + 5

a) f(-1) => 4(-1) + 5 => - 4 +5 => 1

b) 1/4 => 4x + 5 = 1/4 => 4x = 1/4 - 5 => 4x = 1/4 - 20/4 => 4x = - 19/4 =>              x = - 19/4/4 => x = - 19/4 . 1/4 => x = - 19/8

c) f(48) => 4.(48) + 5 => 192 + 5 => 197