# Math Help - Finding the Pre-Image

1. ## Finding the Pre-Image

In f: Z--->N (where N represents natural numbers and Z represents integers.

For the function f(x) = 2|x|, find the pre-image of the set {10, 11, 12, ... , 19}

Would it be {-9, -8, -7, -6, -5, 5, 6, 7, 8, 9}?

2. ## Re: Finding the Pre-Image

Originally Posted by cantuba
in f: Z--->n (where n represents natural numbers and z represents integers.

For the function f(x) = 2|x|, find the pre-image of the set {10, 11, 12, ... , 19}

would it be {-9, -8, -7, -6, -5, 5, 6, 7, 8, 9}?
correct.