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#### Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here. # the point (-1,0) lies on the parabola  Question banks Downloads My Bookmarks Reviews Important topics
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Intern Joined: 10 Jun 2018
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the point (-1,0) lies on the parabola [#permalink] 00:00

Question Stats: 29% (00:54) correct 70% (00:47) wrong based on 17 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

Attachments geometry compare 008.jpg [ 12.03 KiB | Viewed 699 times ]

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

Kudos [?]: 16 , given: 4

Re: the point (-1,0) lies on the parabola [#permalink]
Someone please explain the question. This is one of the questions in test set. Director  Joined: 07 Jan 2018
Posts: 659
Followers: 7

Kudos [?]: 618  , given: 88

Re: the point (-1,0) lies on the parabola [#permalink]
1
KUDOS
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.
GRE Prep Club Legend  Joined: 07 Jun 2014
Posts: 4809
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
Followers: 122

Kudos [?]: 1958 , given: 397

Re: the point (-1,0) lies on the parabola [#permalink]
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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Director Joined: 09 Nov 2018
Posts: 509
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Kudos [?]: 30 , given: 1

Re: the point (-1,0) lies on the parabola [#permalink]
amorphous wrote:
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.

I think, as the question is not complete, answer is nothing but D. Re: the point (-1,0) lies on the parabola   [#permalink] 18 Jan 2019, 17:52
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