Mathematics
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OpenStudy (sagewilson):
Help please, I'm very confused
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OpenStudy (sagewilson):
OpenStudy (anonymous):
\[8^2+10^2=h^2\] is a start
OpenStudy (anonymous):
square and add, what do you get?
OpenStudy (sagewilson):
it would be 64 + 100 giving me 164 = h^2
OpenStudy (sagewilson):
right?
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OpenStudy (anonymous):
yes
OpenStudy (sagewilson):
ok
OpenStudy (anonymous):
not done yet though
OpenStudy (sagewilson):
okay how do I continue from there?
OpenStudy (anonymous):
we got
\[h^2=164\] next we get
\[h=\sqrt{164}\]right?
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OpenStudy (anonymous):
still not done
OpenStudy (sagewilson):
okay
OpenStudy (anonymous):
do you know how to write \[\sqrt{164}\] in simplest radical form?
OpenStudy (sagewilson):
no. Could you show me?
OpenStudy (anonymous):
is it clear that 4 divides 164 evenly?
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OpenStudy (sagewilson):
okay, it would leave me with 41
OpenStudy (anonymous):
so we have
\[164=4\times 41\] which makes
\[\sqrt{164}=\sqrt{4\times 41}=\sqrt4\sqrt{41}\] and since \(\sqrt4=2\) final answer is
\[2\sqrt{41}\]
OpenStudy (sagewilson):
oh, do you mind explaining how you got that, so I can use it for future refernces
OpenStudy (anonymous):
that is why you have a little box on the outside as well as a little box on the inside to fill in in your answer
OpenStudy (anonymous):
sure lets do another by example
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OpenStudy (sagewilson):
okay
OpenStudy (anonymous):
suppose i have
\[\sqrt{50}\]
i see that \(50=25\times 2\) so
\[\sqrt{50}=\sqrt{25\times 2}=\sqrt{25}\sqrt2=5\sqrt2\]
OpenStudy (anonymous):
the middle steps can be mental steps, just writing what i am thinking
look for a perfect square that divides the radicand evenly
OpenStudy (sagewilson):
so you would divide 25 and 2 until they are in their simpelist forms?
OpenStudy (sagewilson):
and since 2 is already the simpilist form there is you leave it as a two
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OpenStudy (anonymous):
i am actually factoring, not dividing
OpenStudy (anonymous):
but yes you have the general idea
OpenStudy (sagewilson):
okay
OpenStudy (anonymous):
\[\sqrt{32}=\sqrt{16\times 2}=\sqrt{16}\sqrt2=4\sqrt2\]
OpenStudy (sagewilson):
thank you for your help
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OpenStudy (anonymous):
yw