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this is the weekly stratergy update that i received from [#permalink]
06 Feb 2006, 13:15
this is the weekly stratergy update that i received from mgmat.
thought that this mught be useful.
Hope I am not violating any copyright issues. if so let me know i will take this post out.
Absolutely positive. That is what everyone knows about an absolute value expression. /3/ = 3 and /-3/ = 3. But why do absolute value bars around a number neutralize, or do away with, the sign of the number? The answer is that absolute value bars are conceptually a measure of the distance of the expression inside the bars from zero. -3 and 3 are both three units away from zero. We will use these two ways of thinking absolute values-- (1) â€œthe guarantee of positiveâ€