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Re: For integers a and x, which of the following values of a guarantees
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27 Nov 2016, 03:09

I did not get the fundamental of this question. So becasue the two roots of the first answer choice are 2 and 2, it is a perfect square? - please correct me if I am wrong. thank you.

Re: For integers a and x, which of the following values of a guarantees
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27 Nov 2016, 23:11

For any quadratic equation ax^2+bx+c = 0 roots are given by [-b+Root(b^2-4ac)]/2a and [-b-Root(b^2-4ac)]/2a For roots to be equal b^2-4ac = 0 Applying it here a=16,-16 From options we get -16 as the answer.

For integers a and x, which of the following values of a guarantees
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28 Oct 2017, 05:19

OreoShake wrote:

I did not get the fundamental of this question. So becasue the two roots of the first answer choice are 2 and 2, it is a perfect square? - please correct me if I am wrong. thank you.

2 is the root of the equation.Question is whether the equations boils down to a perfect square. If you put values of x and a in the equation it will result in to zero.Zero is a perfect square.

Re: For integers a and x, which of the following values of a guarantees
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28 Oct 2017, 20:25

For any quadratic equation ax^2+bx+c = 0 roots For roots to be equal D, b^2-4ac = 0, distinct if D >0, No roots if D<0 Applying it here a=16,-16 Checking options, -16 is the answer. Answer A

gmatclubot

Re: For integers a and x, which of the following values of a guarantees &nbs
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28 Oct 2017, 20:25