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

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

St 1: insufficient: x^2+5x+6 => x^2+3x+2x+6 => x(x+3) + 2(x+3) => (x+2) (x+3) So x = -2 or -3 St 2: insufficient: x^2-10x-24 => x^2 -12x+2x-24 => x(x-12) + 2(x-12) => (x+2) (x-12) So x= -2 or 12

1)+2) x=-2

Hence C.
_________________

Regards SD ----------------------------- Press Kudos if you like my post. Debrief 610-540-580-710(Long Journey): http://gmatclub.com/forum/from-600-540-580-710-finally-achieved-in-4th-attempt-142456.html

1) x = -2 or x = -3. Insufficient. 2) x = -2 or x = 12. Insufficient.

1 & 2 together. x = -2. Sufficient.

The statements never contradict each other. For these statements to contradict each other, statement 2 should not have neither -2 nor -3 as a root. For the statements to be insufficient together, both statements should have more than one common root.

Kudos Please... If my post helped.
_________________

Did you find this post helpful?... Please let me know through the Kudos button.

If we incorrectly solve 2nd equation by factoring (x-4)(x-6) , then the 2 statements would contradict..

Why would we be solving the equation incorrectly?

in case you ever do, in the heat of the pressure . then this knowledge will help you know you have gone wrong :D

You can not do the factorization incorrectly if you know the concept. The -ve sign before 24 indicates you to choose two factors of 24 and subtract it from each other to make 10. So only (12,2) this pair will satisfy.

As per your factorization (x-4)(x-6) the equation becomes x^2-10x+24(which is not in the question).

So the + or - sign before the last constant term will give u clue whether u need to add or subtract.
_________________

Regards SD ----------------------------- Press Kudos if you like my post. Debrief 610-540-580-710(Long Journey): http://gmatclub.com/forum/from-600-540-580-710-finally-achieved-in-4th-attempt-142456.html

Happy New Year everyone! Before I get started on this post, and well, restarted on this blog in general, I wanted to mention something. For the past several months...

It’s quickly approaching two years since I last wrote anything on this blog. A lot has happened since then. When I last posted, I had just gotten back from...

Happy 2017! Here is another update, 7 months later. With this pace I might add only one more post before the end of the GSB! However, I promised that...

The words of John O’Donohue ring in my head every time I reflect on the transformative, euphoric, life-changing, demanding, emotional, and great year that 2016 was! The fourth to...