Maths limit problem

2014-10-26 12:31 am
limit tends to negative infinity,
((x^2+2x)^0.5)-((x^2+1)^0.5)

can anyone help me? I know that the answer is -1, but I don't know how to calculate it.

回答 (1)

2014-10-26 1:32 am
✔ 最佳答案
Please read:


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2014-10-25 18:23:51 補充:
「想問下solution入面第4個=果度點解要let y=-x,如果全式除x點解計到答案係+1而唔係-1」

> 我一早已經預計你會這樣問,所以我特意寫下 Remark,請先看看 Remark 那個部份
> 你看 Remark 就明白為何 let y = -x 會比較易理解,也會明白如果你直接用 x,你也會計到 -1。


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