there's three point on a graph.
pointA(6,4), point B(-k,2), point C(-5,4).
the question wants to find the area of the triangle formed by this three point and express it in terms of k.
thus,
area of the triangle formed = -11-4k
since area has to be positive, so i put modulus? = |-11-k| in order to get positive answer.
but |m|= +-m. true?
so, what is answer the area of the triangle? if i did not use modulus, area of the triangle might be negative. but if i use modulus,|m|= +-m.
confused!