|
|
GMAT 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.
20 Feb 2020, 02:16
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
65% (01:34) correct
35%
(01:53)
wrong
based on 188
sessions
History
Date
Time
Result
Not Attempted Yet
If cx - bx^3 = 0 where b and c are non-zero numbers, what is the value of b - c ?
(1) cx = c
(2) bx = b
(1) cx = c
(2) bx = b
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
shameekv1989
GMAT 3: 720 Q50 V38
Posts: 816
20 Feb 2020, 04:38
Kudos
Bookmarks
Bunuel
Since b and c can not equal 0
x = 1 in both the statements
Hence c-b will always be equal to 0 => Both statements Sufficient
Answer - D
20 Feb 2020, 07:38
Kudos
Bookmarks
Bunuel
Given: cx - bx³ = 0
Target question: What is the value of b - c ?
Statement 1: cx = c
Since we know that c ≠ 0, we can safely divide both sides of the equation by c to get: x = 1
Now plug x = 1 into a given equation, cx - bx³ = 0
We get: c(1) - b(1³) = 0
Simplify to get: c - b = 0, which means c = b, which means b - c = 0
Since we can answer the target question with certainty, statement 1 is SUFFICIENT
Statement 2: bx = b
Since we know that b ≠ 0, we can safely divide both sides of the equation by b to get: x = 1
Now plug x = 1 into a given equation to get: c(1) - b(1³) = 0
Simplify to get: c - b = 0, which means c = b, which means b - c = 0
Since we can answer the target question with certainty, statement 2 is SUFFICIENT
Answer: D
Cheers,
Brent
