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Wilson
Frequent VisitorJoined: 20 Oct 2004Posts: 74
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Posted: Tue Dec 28, 2004 5:27 am Post subject: Find the range of ab
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where both a and b
Show that .
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Kenny TM~
Frequent VisitorJoined: 20 Jan 2004Posts: 127
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Posted: Tue Dec 28, 2004 1:14 pm Post subject:
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通分母 and get a + b + 1 = ab
Suppose a, b are some real roots of a quadratic equation . Hence a + b = -B and ab = C, which means
1 – B = C
So the q.e. is .
Since a, b are real, we have . So
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pop
Frequent VisitorJoined: 05 Apr 2004Posts: 26
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Posted: Tue Dec 28, 2004 2:19 pm Post subject:
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Kenny TM~ wrote:
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| 通分母 and get a + b + 1 = ab |
By
find the range of x and hence get the range of x^2.
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