Each time you read a Problem Solving question, don't forget to ask, "Can I use the answer choices to my advantage?"
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Comment on Simplifying Roots
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Good day
one issue I have is determining the primes to use for large numbers such as the 756, because I mean it could take forever to try and test different prime number to get to such a large number.
Any time saving recommendations?
Thanks
Hi Schalla14,
Hi Schalla14,
You'll see that, to factor 756, you need only know the divisibility rules for 2 and 3. So, it shouldn't take long to find the prime factorization.
On test-day, you won't be required to simplify the square root of a large number that has, within it, big prime factors. For example, you wouldn't need to deal with something like √2023.
ASIDE: 2023 = (17)(17)(7)
So, √2023 = √(17²)(7)
= (√17²)(√7)
= 17√7
Hey Brent,
is there a specific strategy/rules how to pick the numbers? Or is it just trial and error?
Cheers.
It's a good idea to start
It's a good idea to start with small values such as 2, 3 and 5.
This will quickly break the number into smaller and smaller pieces.
Hi Brent, a random question
In the old/archived Study
In the old/archived Study Guide, each activity that's next to a white checkmark box is considered a learning activity.
More here: https://www.gmatprepnow.com/learning-guide/overview