GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
2x^2+4x-30=0
[#permalink]
28 Jul 2020, 10:43
28 Jul 2020, 10:43
Expert Reply
00:00
Question Stats:
95% (00:46) correct
5% (00:52) wrong based on 40 sessions
Hide Show timer Statistics
\(2x^2+4x-30=0\)
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
Quantity A |
Quantity B |
The product of the roots of the equation |
The sum of the roots of the equation |
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
Re: 2x^2+4x-30=0
[#permalink]
28 Jul 2020, 10:59
28 Jul 2020, 10:59
1
We can write equation as x^2+2x−15=0
Let roots be a and b.
So, (x-a)*(x-b) = x^2+2x−15
=> x^x - (a+b)x + ab = x^2+2x−15
=> a+b = -2 and ab = -15
So, the answer is B.
Let roots be a and b.
So, (x-a)*(x-b) = x^2+2x−15
=> x^x - (a+b)x + ab = x^2+2x−15
=> a+b = -2 and ab = -15
So, the answer is B.
Re: 2x^2+4x-30=0
[#permalink]
28 Jul 2020, 16:30
28 Jul 2020, 16:30
1
Carcass wrote:
\(2x^2+4x-30=0\)
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.
Quantity A |
Quantity B |
The product of the roots of the equation |
The sum of the roots of the equation |
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.
The equation can be simplified to 2(x+5)(x-3)=0. Therefore, the roots of the equation are -5 and 3.
Quantity A = (-5)(3) = -15. Quantity B = -5 + 3 = -2. Quantity B is greater.
