Hello all, wondering if you could give me a hand, Prove that the equation 4=x(2-x) has no real roots. Thanks in advance, Max
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Expand, move everything to one side, so that you have a quadratic of the form . Then check the discriminant. If the discriminant is negative, then there are not any real roots.
Thanks a lot, I get it now. Max
Originally Posted by Max888 Hello all, wondering if you could give me a hand, Prove that the equation 4=x(2-x) has no real roots. Thanks in advance, Max Alternatively, here's how Fred Flinstone might have done it... To get a we need a instead of 1 or a instead of Apart from those, we need or or or etc, etc none of which can differ by 2 Much quicker to know the "abc" formula.
Last edited by Archie Meade; July 14th 2010 at 01:17 PM.
Right, thanks a lot!
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