Why does |a - b| not equal to |a| - |b|?
Follow Math Help Forum on Facebook and Google+
Originally Posted by harpazo Why does |a - b| not equal to |a| - |b|? See my other reply.
For one thing, |x- y| is never negative while |x|- |y| may be negative. Take, for example, x= 3, y= 5.
|3 - 5| = |-2| = 2 |3| - |5| 3 - 5 = -2 2 DOES NOT EQUAL -2. Two different expressions.