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What is the value of 2x^2 + 9x − 20?

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What is the value of 2x^2 + 9x − 20? [#permalink] New post   08 Apr 2020, 08:42
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What is the value of \(2x^2 + 9x − 20\)?

    (1) (x +7) * (2x−5)= 0
    (2) x > 0


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What is the value of 2x^2 + 9x − 20? [#permalink] New post   Updated on: 09 Apr 2020, 08:21
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I hope you were able to internalize the skill of "Steering clear of DS Traps" by solving this question. Go through the official solution below and ensure that you understand the right method to solve this question. All the best!


Originally posted by GMATWhizTeam on 08 Apr 2020, 11:59.
Last edited by GMATWhizTeam on 09 Apr 2020, 08:21, edited 1 time in total.
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What is the value of 2x^2 + 9x − 20? [#permalink] New post   08 Apr 2020, 12:11
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preetamsaha minustark shameekv1989 sauravleo123 prateek25 Here is the 1st practice question of Day 4. Do solve it and share your explanations below. All the best!
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Re: What is the value of 2x^2 + 9x − 20? [#permalink] New post   08 Apr 2020, 12:22
1. (x+7)(2x-5)=0 implies 2x^2 + 9x - 35 = 0 implies 2x^2 + 9x -20 = 15...sufficient

2. x> 0..insufficient

Ans. should be A
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Re: What is the value of 2x^2 + 9x − 20? [#permalink] New post   08 Apr 2020, 13:03
What is the value of \(2x^2 + 9x − 20\)?

    (1) (x +7) * (2x−5)= 0
    (2) x > 0

i) x = -7 or x = 5/2

Solving for x = -7 => 2*(-7)^2 + 9(-7) - 20 = 98 - 63 - 20 = 15

Solving for x = 5/2 => 25/2 + 45/2 - 20 = 35 - 20 = 15

- Sufficient

ii) x > 0 - Insufficient

Answer - A
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Re: What is the value of 2x^2 + 9x − 20? [#permalink] New post   08 Apr 2020, 19:59
1. X=-7 or X=5/2
hence sufficient

2.X>0 multiple values of X
hence insufficient

Thus A

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Re: What is the value of 2x^2 + 9x − 20? [#permalink] New post   08 Apr 2020, 23:41
Ans: A

1)(x +7) * (2x−5)= 0
so,x = -7 or 5/2

solving for x=-7,2x2+9x−20=2.49-63-20=15
solving for x=5/2, 25/4+45/2-20=15

as putting both the possible values in the equation,we are getting same value 15, so eq1 is sufficient.

2)x > 0 - Insufficient
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Re: What is the value of 2x^2 + 9x − 20? [#permalink]
08 Apr 2020, 23:41
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