These are probably pretty dumb questions but I must finally clarify these.
1) As far as GMAT concerned, is 0 an even number? Princeton Review tells me it is NOT. Kaplan tells me it IS. Could someone clarify this for me once and for all? Is 0 an even number or not?
2) This one is a little longer but should be as easy for most of you to answer. I can't think of a non-confusing way to ask this so I will do it with an example of an OG problem. It gave the following equation: sqrt(3-2x) = sqrt(2x)+1, and asked for 4x^2.
What I did immediately was square both sides and I got: 3-2x=2x+1 but that was wrong because OG got: (sqrt(3-2x))^2 = (sqrt(2x)+1))^2. My mistake was that I squared each individual element instead of putting each side in parentheses and squaring that. However, after a few operations, OG divided equation 2-4x = 2sgrt(2x) by 2 and this time they divided each individual element by 2 and got 1-2x = sqrt(2x) instead of putting each side in parentheses and dividing them by 2. My question is why. Why did we have to put them in parentheses before squaring but not before dividing each side. And how would we go about multiplying each side?
Thank you for any help
1) As far as GMAT concerned, is 0 an even number? Princeton Review tells me it is NOT. Kaplan tells me it IS. Could someone clarify this for me once and for all? Is 0 an even number or not?
2) This one is a little longer but should be as easy for most of you to answer. I can't think of a non-confusing way to ask this so I will do it with an example of an OG problem. It gave the following equation: sqrt(3-2x) = sqrt(2x)+1, and asked for 4x^2.
What I did immediately was square both sides and I got: 3-2x=2x+1 but that was wrong because OG got: (sqrt(3-2x))^2 = (sqrt(2x)+1))^2. My mistake was that I squared each individual element instead of putting each side in parentheses and squaring that. However, after a few operations, OG divided equation 2-4x = 2sgrt(2x) by 2 and this time they divided each individual element by 2 and got 1-2x = sqrt(2x) instead of putting each side in parentheses and dividing them by 2. My question is why. Why did we have to put them in parentheses before squaring but not before dividing each side. And how would we go about multiplying each side?
Thank you for any help
