Posted: Tue Dec 28, 2004 5:27 am Post subject: Find the range of ab

where both a and b
Show that .

Kenny TM~

Frequent VisitorJoined: 20 Jan 2004Posts: 127

Posted: Tue Dec 28, 2004 1:14 pm Post subject:

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

pop

Frequent VisitorJoined: 05 Apr 2004Posts: 26

Posted: Tue Dec 28, 2004 2:19 pm Post subject:

Kenny TM~ wrote:

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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