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Comment on “Fixing” the Denominator
I initially took root 25 and
Sorry, which question are you
Sorry, which question are you referring to?
I think they were referring
Thanks kdusold!
Thanks kdusold!
So, we're referring to the question at 2:24 in the video.
Once we get to 2√50/15, we can still simplify √50 in the numerator.
√50 = √(25 x 2) = (√25)(√2) = 5√2
So, 2√50/15 = (2)(5√2)/15 = (10√2)/15 = (2√2)/3
Can you multiply conjugate
Yes. The technique works will
Yes. The technique works will all denominators.
I dont understand where 10
I believe you're referring to
I believe you're referring to what happens at 5:53 in the video.
We have 2√25
√25 = 5
So, 2√25 = (2)(√25)
= (2)(5)
= 10
Cheers,
Brent
If all the terms in the
The basic structure remains
The basic structure remains the same.
1) If we have (some term) + (some other term), then the conjugate is (some term) - (some other term)
2) If we have (some term) - (some other term), then the conjugate is (some term) + (some other term)
So, for example, if we have √3 + 4, then the conjugate is √3 - 4
If we have -√3 - 4, then the conjugate is -√3 + 4
Does that help?
Cheers,
Brent
Is the best approach to the
Question link: https:/
Question link: https://gre.myprepclub.com/forum/if-c-and-d-are-positive-integers-and-m-...
Yes, testing values definitely is the best/fastest approach for that question.
Cheers,
Brent
around 4:00 in the video the
would this not be simplified to be (10√2)/7 ?
15 and 5√2 are not "like
15 and 5√2 are not "like terms," so we can't combine them (in the same way that 15 - 5x does not simplify to be 10x.)
IF the expression were 15√2 - 5√2, then it would simplify to be 10√2
However, as it stands we can't simplify 15 - 5√2
For more on this, watch: https://www.greenlighttestprep.com/module/gre-powers-and-roots/video/1042
Hi Brent,
thanks for always with your response. I have a silly question here. When do you decide to use the conjugate method?
Good question.
Good question.
If the numerator is in the form √k, then multiply numerator and denominator by √k.
If the numerator is in the form √k + c, then multiply numerator and denominator by √k - c.
If the numerator is in the form √k - c, then multiply numerator and denominator by √k + c.
perfect, thanks