Choose the correct alternative in the following:
If f(x) = |x2 – 9x + 20|, then f’(x) is equal to
f(x) = |x2 – 9x + 20|
= |x2 – 4x – 5x + 20|
= |x(x – 4) – 5(x – 4)|
f(x) = | (x –5) (x – 4) |
