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If x^2 – 4x = 5, then one possible value of x – 4 =
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02 Mar 2021, 09:07
02 Mar 2021, 09:07
Expert Reply
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Question Stats:
63% (00:56) correct
36% (00:46) wrong based on 36 sessions
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If x^2 – 4x = 5, then one possible value of x – 4 =
A. -9
B. -5
C. -3
D. -1
E. 5
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
A. -9
B. -5
C. -3
D. -1
E. 5
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
Re: If x^2 – 4x = 5, then one possible value of x – 4 =
[#permalink]
02 Mar 2021, 09:19
02 Mar 2021, 09:19
1
x^2 – 4x = 5
x^2 – 4x - 5 = 0
(X-5)(x+1) = 0
x = 5 OR -1
x-4 can be 5-4 = 1 & -1-4 = -5
Answer B
x^2 – 4x - 5 = 0
(X-5)(x+1) = 0
x = 5 OR -1
x-4 can be 5-4 = 1 & -1-4 = -5
Answer B
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Re: If x^2 – 4x = 5, then one possible value of x – 4 =
[#permalink]
02 Mar 2021, 09:45
02 Mar 2021, 09:45
2
Carcass wrote:
If x^2 – 4x = 5, then one possible value of x – 4 =
A. -9
B. -5
C. -3
D. -1
E. 5
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
A. -9
B. -5
C. -3
D. -1
E. 5
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
x^2 – 4x = 5
Rearrange to get: x^2 – 4x - 5 = 0
Factor: (x - 5)(x + 1) = 0
So, either x = 5 or x = -1
If x = 5, then x - 4 = 5 - 4 = 1 [not among the answer choices]
If x = -1, then x - 4 = (-1) - 4 = -5. Great!
Answer: B
Cheers,
Brent
