To solve the equation with absolute value: given that x is a real number, M = | x + 1 | + | x + 2 | + | x + 3 |, find the minimum value of M

To solve the equation with absolute value: given that x is a real number, M = | x + 1 | + | x + 2 | + | x + 3 |, find the minimum value of M

X = - 2
by
two
In general, f (x) = | x-a1 | + | x-a2 | +... + | x-an|
a1