Events & Promotions
|
|
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.
Jul 1909:00 AM PDT
-11:00 AM PDT
Struggling to stay on time during Multi-Source Reasoning (MSR) questions on the GMAT? In this video, GMAT expert Karishma Bansal (founder of ANA Prep) breaks down a 3-minute scanning strategy that can help you save critical time...
Jul 1911:00 AM IST
-01:00 PM IST
Do RC/MSR passages scare you? e-GMAT is conducting a masterclass to help you learn – Learn effective reading strategies Tackle difficult RC & MSR with confidence Excel in timed test environment
Jul 1911:30 AM EDT
-12:30 PM EDT
Struggling to find the right strategies to score a 99 %ile on GMAT Focus? Riya (GMAT 715) boosted her score by 100-points in just 15 days! Discover how the right mentorship, tailored strategies, and an unwavering mindset can transform your GMAT prep.
Jul 1410:00 AM PDT
-11:59 PM PDT
GMAT Preparation Online - A limited time sale use code: EXPERTSGLOBAL10- Jul 17
03:00 PM IST
-11:00 AM IST
Start your journey with a fully customized action plan and work with a dedicated mentor to achieve a 735+ score. - Jul 18
08:30 AM PDT
-09:30 AM PDT
Wondering how to craft compelling Career goals for your "Why MBA" essay? In this video, Gunjan Jhunjhunwala, seasoned MBA expert at The Red Pen, will walk you through how to: Define clear short-term and long-term goals, and more. 
Jul 2006:30 AM PDT
-08:30 AM PDT
Stuck at a score plateau and struggling to hit your target score? Join this Masterclass to understand how you should turn around your prep to reach your goal in just 40 days. Discover what top scorers know that you don’t!- Jul 20
10:00 AM PDT
-11:00 AM PDT
Join us in a live GMAT Verbal practice session to solve 10 tough questions from the Reading Comprehension section tested in the GMAT Verbal section. Take this quiz with other test takers in timed conditions. - Jul 22
10:00 AM PDT
-11:00 AM PDT
In our second video about test accommodations for the GMAT exam, GMAT Ninja’s founder chats with Jason Northrup, Test Accommodations Senior manager at GMAC, about the three main qualifying condition categories... - Jul 23
08:00 PM PDT
-09:00 PM PDT
Full-length FE mock with insightful analytics, weakness diagnosis, and video explanations! 
Jul 2410:00 AM EDT
-11:00 AM EDT
More Target Test Prep students are earning 100th percentile GMAT scores. Don’t settle for less when the Target Test Prep course gives you everything you need to score high on the GMAT. Start your 5-day free trial today.
Jul 2510:00 AM EDT
-11:00 AM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors..
29 Mar 2017, 02:42
Kudos
Bookmarks
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
79% (01:33) correct
21%
(02:01)
wrong
based on 694
sessions
History
Date
Time
Result
Not Attempted Yet
\(x(5+\sqrt{7})=90\)
In the equation above, x =
A. \(5(5-\sqrt{7})\)
B. 15/2
C. 45
D. \(90(5-\sqrt{7})\)
E. \(90(5+\sqrt{7})\)
In the equation above, x =
A. \(5(5-\sqrt{7})\)
B. 15/2
C. 45
D. \(90(5-\sqrt{7})\)
E. \(90(5+\sqrt{7})\)
0akshay0
Joined: 19 Apr 2016
Last visit: 14 Jul 2019
Posts: 194
Given Kudos: 59
Location: India
Schools: Jindal '20 Kelley '20 Broad '20 Carey '20 Mays '20
GMAT 1: 570 Q48 V22
GMAT 2: 640 Q49 V28
GPA: 3.5
WE:Web Development (Computer Software)
29 Mar 2017, 03:20
Kudos
Bookmarks
Bunuel
\(x(5+\sqrt{7})=90\)
In the equation above, x =
A. \(5(5-\sqrt{7})\)
B. 15/2
C. 45
D. \(90(5-\sqrt{7})\)
E. \(90(5+\sqrt{7})\)
In the equation above, x =
A. \(5(5-\sqrt{7})\)
B. 15/2
C. 45
D. \(90(5-\sqrt{7})\)
E. \(90(5+\sqrt{7})\)
\(x(5+\sqrt{7}) = 90\)
\(x = 90/(5+\sqrt{7})\)
\(x = (90*(5-\sqrt{7}))/((5+\sqrt{7})*(5-\sqrt{7}))\)
\(x = (90*(5-\sqrt{7}))/(25-7)\)
\(x = (90*(5-\sqrt{7}))/18\)
\(x = 5*(5-\sqrt{7})\)
Hence option A is correct
Hit Kudos if you liked it
General Discussion
16 Oct 2018, 18:14
Kudos
Bookmarks
Bunuel
\(x(5+\sqrt{7})=90\)
In the equation above, x =
A. \(5(5-\sqrt{7})\)
B. 15/2
C. 45
D. \(90(5-\sqrt{7})\)
E. \(90(5+\sqrt{7})\)
In the equation above, x =
A. \(5(5-\sqrt{7})\)
B. 15/2
C. 45
D. \(90(5-\sqrt{7})\)
E. \(90(5+\sqrt{7})\)
Simplifying we have:
x = 90/(5 + √7)
We must rationalize the denominator by multiplying numerator and denominator of the right side of the equation by the conjugate of (5 + √7). The conjugate of (5 + √7) is (5 - √7). Multiplying the rightside by (5 - √7)/(5 - √7), we have:
90(5 - √7)/(25 - 7) = 90(5 - √7)/18 = 5(5 - √7)
Answer: A
