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Does the line represented by ax^2+bx+c intersect the x-axis?

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Does the line represented by ax^2+bx+c intersect the x-axis? [#permalink] New post 21 Feb 2006, 17:11
Does the line represented by ax^2+bx+c intersect the x-axis?

I) a>0
II) c<0
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Re: parabola [#permalink] New post 21 Feb 2006, 18:50
joemama142000 wrote:
Does the line represented by ax^2+bx+c intersect the x-axis?

I) a>0
II) c<0


C

the equation will intersect x-axis at ax^2+bx+c=0
so we basically need to find out if this eqn has real roots
or is b^2 - 4ac > 0 or not

i] insuff
ii] insuff

i] & ii] - suff
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Re: parabola [#permalink] New post 21 Feb 2006, 22:13
believe2 wrote:
joemama142000 wrote:
Does the line represented by ax^2+bx+c intersect the x-axis?

I) a>0
II) c<0


C

the equation will intersect x-axis at ax^2+bx+c=0
so we basically need to find out if this eqn has real roots
or is b^2 - 4ac > 0 or not

i] insuff
ii] insuff

i] & ii] - suff


ok , get it sir.. thnks
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Re: parabola   [#permalink] 21 Feb 2006, 22:13
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Does the line represented by ax^2+bx+c intersect the x-axis?

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