Hi
The attached question's answer is D. But I have two things that I did not understand...
1) in OG, it says √(x-5)^2 = lx-5l ,therefore, lx-5l=5-x.
But I thought, if √(x-5)^2 = 5-x, then we can make both sides squared and it will be (x-5)^2 = (5-x)^2. Can you explain why we can not both sides squared ???
2) for the first condition, -xlxl>0, but I don't get what this means....
Thanks again.
Rina
The attached question's answer is D. But I have two things that I did not understand...
1) in OG, it says √(x-5)^2 = lx-5l ,therefore, lx-5l=5-x.
But I thought, if √(x-5)^2 = 5-x, then we can make both sides squared and it will be (x-5)^2 = (5-x)^2. Can you explain why we can not both sides squared ???
2) for the first condition, -xlxl>0, but I don't get what this means....
Thanks again.
Rina
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