Help! Does anyone know about this "PERFECT SQUARES METHOD"?
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OpenStudy (anonymous):
OpenStudy (welshfella):
No - i tried looking it up but couldn't find anything
I'll try again...
OpenStudy (anonymous):
Ok...
OpenStudy (anonymous):
squares. So are and . 1/25 and9/4
OpenStudy (anonymous):
Any number that is the square of a rational number. For example, 0, 1, 4, 9, 16, 25, etc. are all perfect
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OpenStudy (anonymous):
Think its also known as the "Golden Method".
OpenStudy (welshfella):
yes I can understand how you can pick out perfect square factors with something like sqrt28
= sqrt (4*7) = sqrt4 * sqrt7 = 2 sqrt7
4 being the perfect square
OpenStudy (welshfella):
but how do you apply it to a prime number like 79?
OpenStudy (anonymous):
idk???
OpenStudy (welshfella):
Oh i just noticed
it says use the ratio of perfect squares method
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OpenStudy (anonymous):
ok what next ?
OpenStudy (welshfella):
I looked it up and its applicable to certain numbers but not to 79 which is a prime number
OpenStudy (anonymous):
what the heck do u put????
OpenStudy (welshfella):
sorry idk
OpenStudy (anonymous):
can u help me with another question?
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OpenStudy (anonymous):
different topic
OpenStudy (anonymous):
OpenStudy (anonymous):
-4?
OpenStudy (welshfella):
yes
OpenStudy (anonymous):
Last one!!!
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OpenStudy (welshfella):
x^3 = 27
x = ?
OpenStudy (welshfella):
a good approximation of sqrt79 would be sqrt80
sqrt80 = sqrt(4 * 4*5) = 4 sqrt5
OpenStudy (welshfella):
4 sqrt5 = 8.94 to nearest hundredth
OpenStudy (welshfella):
the actual squre root on my calculator is 8.89
OpenStudy (anonymous):
ok...
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OpenStudy (anonymous):
What is the answer?
OpenStudy (welshfella):
to what ?
OpenStudy (welshfella):
sqrt79 ? - thats 8.89
OpenStudy (anonymous):
Simp=8.9?
OpenStudy (anonymous):
wait thats the final answer?
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OpenStudy (welshfella):
yes
OpenStudy (anonymous):
I don't think so...really 8.9?
OpenStudy (anonymous):
Your 100% sure?
OpenStudy (welshfella):
no the real square root is 8.89 ( to nearest 1 hundredth)
OpenStudy (anonymous):
You can only enter 2 numbers and a decimal
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OpenStudy (welshfella):
in an answer box you mean?
OpenStudy (welshfella):
the question asks for the nearest hundredth - thats 2 numbers after the dec.mal