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# the point (-1,0) lies on the parabola

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Intern
Joined: 10 Jun 2018
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the point (-1,0) lies on the parabola [#permalink]  06 Sep 2018, 18:14
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Question Stats:

33% (00:59) correct 66% (00:35) wrong based on 9 sessions
Consider the following parabola symmetric along x axis

the point (-1,0) lies on the parabola

 Quantity A Quantity B $$x$$ $$-y^2+1$$
[Reveal] Spoiler: OA

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Intern
Joined: 10 Jun 2018
Posts: 32
Followers: 0

Kudos [?]: 14 [0], given: 4

Re: the point (-1,0) lies on the parabola [#permalink]  06 Sep 2018, 18:15
Someone please explain the question. This is one of the questions in test set.
Director
Joined: 07 Jan 2018
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Kudos [?]: 479 [1] , given: 84

Re: the point (-1,0) lies on the parabola [#permalink]  07 Sep 2018, 09:21
1
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NixonDutt wrote:
Someone please explain the question. This is one of the questions in test set.

The question is not complete. Put up a complete question.
GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4750
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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Re: the point (-1,0) lies on the parabola [#permalink]  07 Sep 2018, 15:27
Expert's post
Explanation

Here we have been given a parabola symmetric along x axis.

General Equation of parabola is : $$y^2=ax+b$$ So rewrititng this equation in the form of quantities we can say:

$$x=\frac{1}{a}y^2 -\frac{b}{a}$$

Hence the two qty are equal when $$a=-1$$ and $$\frac{b}{a}=-1$$ or $$b=1$$

Now in order to calculate two variables namely $$a$$ and $$b$$ we need two eaquations. We can get one equation by putting the point (-1, 0) in the parabola equation $$y^2=ax+b$$. Hence we cannot say if the answer is C or not!

Depending upon the second point of the parabola the quantities may or maynot be equal.

_________________

Sandy
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Re: the point (-1,0) lies on the parabola   [#permalink] 07 Sep 2018, 15:27
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