Question

If the range of the function f(x) = 4x – 3 is {11.4, 15, 17, 29}, what is its domain?

A. {1.5, 2.8, 5.5, 7}
B.{2.3, 4, 8, 11}
C. {7, 11, 13.2, 14}
D. {3.4, 5, 8, 9.3}
E.{3.6, 4.5, 5, 8}

Answer 1

find x for each range value.

for example, 11.4 = 4x-3⇒ x=14.4/4 =3.6

all the x values together constitute the domain.

But, in this case, only the last option has 3.6

hence, answer is E