Lesson: Combining Factoring Techniques

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Reinforcement Activities

Comment on Combining Factoring Techniques

bilalspeaks - June 1, 2017
Hi. I noticed that there is a lot of practice with difference of squares. Do you know of any sources that can provide practice with the other two special products?
gmat-admin's picture

gmat-admin - June 2, 2017

You'll find some questions in the Reinforcement Activities boxes here https://www.gmatprepnow.com/module/gmat-algebra-and-equation-solving/vid... and here https://www.gmatprepnow.com/module/gmat-algebra-and-equation-solving/vid...

bilalspeaks - June 4, 2017
Thank you!!

fzkerdoum - July 24, 2018
f a, b, and c are constants, a > b > c, and x^3 - x = (x - a)(x - b)(x - c) for all numbers x, what is the value of b ?

(A) - 3
(B) -1
(C) 0
(D) 1
(E) 3

Hi Brent,

Grateful for your solution for the above mentioned question please.
Thanks a lot
Fatima-Zahra
gmat-admin's picture

gmat-admin - July 24, 2018

Nice question! I've now added it to the Reinforcement Activities.

Here's my full solution: https://gmatclub.com/forum/if-a-b-and-c-are-constants-a-b-c-and-x-3-x-x-...

Cheers,
Brent

jewelmme - August 7, 2018
C = -1
gmat-admin's picture

gmat-admin - August 7, 2018

Yes, that's correct.

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