Functions - modulus

Question 1

from f(x) -> Sketching |f(x)|

Answer 1

1. preserve any positive part of f(x)
2. reflct any negative part of f(x) in x axis

Question 2

from f(x) -> f(|x|)

Answer 2

1. preserve any positive part of f(x) when x is positive
2. reflect f(x), x≥0 in y axis

Question 3

When solving modulus, check for

Answer 3

1. find zeros
2. find when - and +
3. check if this is true for zeros