In the interval $(1, 2)$, the function $f(x) = 2|x - 1| + 3|x - 2|$ is:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → strictly decreasing. ##
$f(x) = 2|x - 1| + 3|x - 2|$
In $(1, 2)$
$f(x) = +2(x - 1) - 3(x - 2)$
$= 2x - 2 - 3x + 6$
$= -x + 4$
$∵f'(x) = -1$
$f'(x) < 0$
$\Rightarrow f(x)$ is strictly decreasing.