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x^2-4x-21
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07 Apr 2021, 05:11
07 Apr 2021, 05:11
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\(x^2-4x-21=0\)
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
Quantity A |
Quantity B |
sum of the roots |
product of the roots |
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
Re: x^2-4x-21
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07 Apr 2021, 05:18
07 Apr 2021, 05:18
For a quadratic equation ax^2 + bx + c = 0, the sum of its roots = –b/a and the product of its roots = c/a.
For, x^2 − 4x − 21 = 0
(Qnt A) Sum of the roots = -b / a = - (-4) / 1 = 4
(Qnt B) Product of the roots = c / a = -21 / 1 = -21
So Qnt A > Qnt B.
For, x^2 − 4x − 21 = 0
(Qnt A) Sum of the roots = -b / a = - (-4) / 1 = 4
(Qnt B) Product of the roots = c / a = -21 / 1 = -21
So Qnt A > Qnt B.
gmatclubot
Re: x^2-4x-21 [#permalink]
07 Apr 2021, 05:18
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