Explanation:
ok ? soooo .... ?
we need to put 5.5 in each place of x in the function expression and simply calculate.
you remember, the absolute value removes any negative sign of the value, but leaves the value unchanged in any other way.
d(x) for x = 5.5 means
d(5.5) = -2|5.5² - 3.6| = -2|30.25 - 3.6| = -2|26.65| =
= -2 × 26.65 = -53.3
the absolute value only handles everything that is inside its functional "borders", but nothing outside.
so, the -2 factor stayed -2, and the value inside the absolute value function was already positive anyway. so nothing changed there.