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## Comment on

Combining Factoring Techniques## Hi. I noticed that there is a

## You'll find some questions in

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...

## Thank you!!

## f a, b, and c are constants,

(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

## Nice question! I've now added

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

## C = -1

## Yes, that's correct.

Yes, that's correct.

## Could you please explain an

If xy =/ 0, is x^3 + y^3 > 0?

1. x + y > 0

2. xy > 0

## Tricky question!

Tricky question!

Here's my full solution: https://gmatclub.com/forum/if-xy-0-is-x-3-y-268848-20.html#p2637435

By the way, FACTORING sums of cubes is beyond the scope of the GMAT. However, for this question, we need not factor x³ + y³.

## https://gmatclub.com/forum/15

so I'm not sure but lowered choices that unit digit is 3.

here is what I do, so 15(15+54) unit digit is 5, (27-22)^2 unit digit is 5, add up to 0 and 63(-63+44) unit digit is -7 so that's why I narrowed down to 33% chances.

## Question link: https:/

Question link: https://gmatclub.com/forum/15-310016.html

Perfect! As you can see, the question is super difficult. In such cases, student's must be on the lookout to maximize their odds of answering correctly. That's exactly what you did.

Nice work!

## Sorry, I made a mistake here