Maths
2008-08-21 8:20 pm
Is √a^2 =a ture for any value of a?Give a example to support your answer?
回答 (1)
2008-08-21 8:43 pm
✔ 最佳答案
√a^2 =a is true for non-negative a onlyFor a=-1
L.H.S.=√(-1)^2=√1=1
R.H.S.=-1
contradiction arises.
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