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abhijit_sen
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If f(x)=a1x^2+a2, then does the function intersect x axis? 17 Aug 2008, 05:31
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If f(x)=a1x^2+a2, then does the function intersect x axis?

1) a1 > 0
2) a2 < 0



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If f(x)=a1x^2+a2, then does the function intersect x axis? 17 Aug 2008, 05:43
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IT can be answered using both the information. So IMO C.

When A1 > 0 and A2 < 0 => we atleast kno that for x=0 f(x) is -ve and for some values of x f(x) will be +ve .
So f(x) will intesect X-axis.
The two conditions independently can not answer the question.
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If f(x)=a1x^2+a2, then does the function intersect x axis? Updated on: 17 Aug 2008, 06:29
Originally posted by durgesh79 on 17 Aug 2008, 06:07.
Last edited by durgesh79 on 17 Aug 2008, 06:29, edited 1 time in total.
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abhijit_sen
If f(x)=a1x^2+a2, then does the function intersect x axis?

1) a1 > 0
2) a2 < 0
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function will intersect x axis when f(x) = 0
the question can be asked as "Is it possibile to have a1x^2 + a2 = 0 "
now x^2 will always be postive, so the function will be zero only if a1 and a2 have different signs

Option C
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If f(x)=a1x^2+a2, then does the function intersect x axis? 17 Aug 2008, 06:21
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Ya.. using both statements it can be answered. Parabola.



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