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Mathematics 9 Online
OpenStudy (sagewilson):

Help please, I'm very confused

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?

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?

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?

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

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

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

OpenStudy (anonymous):

yw

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