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.
Apr 2308:00 PM PDT
-09:00 PM PDT
Video explanations + diagnosis of 10 weakest areas + 150+ short videos + study plan!
Apr 2301:30 AM EDT
-02:30 AM EDT
Struggling with GMAT Verbal as a non-native speaker? Harsh improved his score from 595 to 695 in just 45 days—and scored a 99 %ile in Verbal (V88)! Learn how smart strategy, clarity, and guided prep helped him gain 100 points.
Apr 2512:30 AM EDT
-01:30 AM EDT
At one point, she believed GMAT wasn’t for her. After scoring 595, self-doubt crept in and she questioned her potential. But instead of quitting, she made the right strategic changes. The result? A remarkable comeback to 695. Check out how Saakshi did it.
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2711:00 AM EDT
-12:00 PM 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
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
04 Jan 2022, 04:15
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
55% (01:50) correct
45%
(01:50)
wrong
based on 658
sessions
History
Date
Time
Result
Not Attempted Yet
How many real solutions exist for the equation \(x^2 – 11|x| - 60 = 0\)?
A. 4
B. 3
C. 2
D. 1
E. 0
A. 4
B. 3
C. 2
D. 1
E. 0
05 Jan 2022, 22:33
Kudos
Bookmarks
\(x^2–11|x|−60=0\)
Case 1: \(x ≥ 0\)
\(x^2–11x−60=0\)
When ever the sign of the constant C in the quadratic equation of general form ax^2 + bx + c =0 is negative, then two roots will be of opposite sign,i.e one root is +ve and other one is -ve.
Since the condition of case 1 is x ≥ 0 , we will consider only the positive root.
Case 2: \(x< 0\)
\(x^2+11x−60=0\)
Same concept we can apply in case 2 as well. The sign of constant C is -ve in the quadratic equation, so here also we have 2 roots , one's + ve and the other -ve.
Since x should be less than zero, we will consider only the -ve root.
Combining case 1 and 2, Only two real solutions exist for the equation.
Option C is the answer.
Thanks,
Clifin J Francis
Case 1: \(x ≥ 0\)
\(x^2–11x−60=0\)
When ever the sign of the constant C in the quadratic equation of general form ax^2 + bx + c =0 is negative, then two roots will be of opposite sign,i.e one root is +ve and other one is -ve.
Since the condition of case 1 is x ≥ 0 , we will consider only the positive root.
Case 2: \(x< 0\)
\(x^2+11x−60=0\)
Same concept we can apply in case 2 as well. The sign of constant C is -ve in the quadratic equation, so here also we have 2 roots , one's + ve and the other -ve.
Since x should be less than zero, we will consider only the -ve root.
Combining case 1 and 2, Only two real solutions exist for the equation.
Option C is the answer.
Thanks,
Clifin J Francis
General Discussion
04 Jan 2022, 06:55
Kudos
Bookmarks
|x|=x for x>0
-x.for x<0
Case I (for x>0)
x²-11x-60=0
X=15
Case II (for x<0)
x²+11x-60=0
X=-15
So only 2 real values are possible for the above equation..
C is the answer.
Posted from my mobile device
-x.for x<0
Case I (for x>0)
x²-11x-60=0
X=15
Case II (for x<0)
x²+11x-60=0
X=-15
So only 2 real values are possible for the above equation..
C is the answer.
Posted from my mobile device
