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.
If (r − 8) is a factor of
[#permalink]
02 Aug 2021, 14:23
02 Aug 2021, 14:23
Expert Reply
00:00
Question Stats:
66% (01:02) correct
33% (01:06) wrong based on 30 sessions
Hide Show timer Statistics
If \((r − 8)\) is a factor of \(r^2-kr-56\), then \(k=\)
(A) -15
(B) -10
(C) -1
(D) 1
(E) 10
(A) -15
(B) -10
(C) -1
(D) 1
(E) 10
Retired Moderator
Joined: 19 Nov 2020
Posts: 326
Given Kudos: 64
GRE 1: Q160 V152
If (r − 8) is a factor of
[#permalink]
02 Aug 2021, 15:57
02 Aug 2021, 15:57
1
-k=-8+a
-56=-8*a, 7=a AND -k=-8+7=-1; k=1 Answer is D
-56=-8*a, 7=a AND -k=-8+7=-1; k=1 Answer is D
Carcass wrote:
If \((r − 8)\) is a factor of \(r^2-kr-56\), then \(k=\)
(A) -15
(B) -10
(C) -1
(D) 1
(E) 10
(A) -15
(B) -10
(C) -1
(D) 1
(E) 10
If (r − 8) is a factor of
[#permalink]
02 Aug 2021, 19:30
02 Aug 2021, 19:30
2
\(r - 8\) is a factor of the given equation.
\(r^2-kr-56\)
put \(r = 8\)
\(64 - 8r - 56 = 0\)
\(8 -8r = 0\)
\(r = 1\)
Answer D
\(r^2-kr-56\)
put \(r = 8\)
\(64 - 8r - 56 = 0\)
\(8 -8r = 0\)
\(r = 1\)
Answer D
