there's three point on a graph.

pointA(6,4), pointB(-k,2), pointC(-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!