Hey guys,
I was surprised that there were roots of 3 and 4 like in this question. Should we really have to know them or there is some kind of shortcut or trick how to compute them quickly?
Thanks in advance!
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Stuart@KaplanGMAT
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You don't actually have to know the values, you just have to apply a bit of common sense.
We know that sqrt(4) = 2.
We also know that both the cube root and quardic root of ANY number greater than 1 will themselves be greater than 1.
So, we have:
2 + (more than 1) + (more than 1) = more than 4: choose (e).
We know that sqrt(4) = 2.
We also know that both the cube root and quardic root of ANY number greater than 1 will themselves be greater than 1.
So, we have:
2 + (more than 1) + (more than 1) = more than 4: choose (e).
Stuart Kovinsky | Kaplan GMAT Faculty | Toronto
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musicdaemon
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Dear Stuart,Stuart Kovinsky wrote:You don't actually have to know the values, you just have to apply a bit of common sense.
We know that sqrt(4) = 2.
We also know that both the cube root and quardic root of ANY number greater than 1 will themselves be greater than 1.
So, we have:
2 + (more than 1) + (more than 1) = more than 4: choose (e).
What is your take at -> sqrt(4) = +2 or -2
if sqrt(4)=-2 then the answer is ambiguous
what do you think?
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