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OpenStudy (anonymous):
find a if
sqrta(sqrt6)=3sqrt2
find b if
sqrt10(sqrt5+sqrtb)=5sqrt2+2sqrt5
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OpenStudy (zepp):
\[\large \sqrt{\sqrt{6}}=3\sqrt{2}\]
Like this? D:
OpenStudy (anonymous):
no
OpenStudy (zepp):
\[\large \sqrt{a}\sqrt{6}=3\sqrt{2}\]\[\large \sqrt{10}(\sqrt{5}+\sqrt{b})=5\sqrt2+2\sqrt5\]
Like this?
OpenStudy (anonymous):
\[Find a if \sqrt{a}(\sqrt{6})=3\sqrt{2}\]
OpenStudy (anonymous):
yes like that
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OpenStudy (zepp):
Alright \[\large \sqrt{a}\sqrt{6}=3\sqrt{2}=\sqrt{9}\sqrt{2}=\sqrt{2*9}=\sqrt{18}\]
\(\large \sqrt{a}\sqrt{6}=\sqrt{18}\rightarrow \sqrt{a}=\frac{\sqrt{18}}{\sqrt{6}}\rightarrow a=\sqrt{\frac{18}{6}}^2=\sqrt{3}^2=3\)
OpenStudy (anonymous):
i dont get it
OpenStudy (anonymous):
how did u know a was 9
OpenStudy (anonymous):
nvm i get that
OpenStudy (anonymous):
i dont get the last part
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OpenStudy (zepp):
Which part?
OpenStudy (zepp):
The second line?
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
is the answer not sqrt18
OpenStudy (zepp):
That was still the first question!
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OpenStudy (anonymous):
its ok nvm i understand, what about the next one
OpenStudy (anonymous):
do i do the f2nd one like the first
OpenStudy (anonymous):
b=2 correct??
OpenStudy (zepp):
\[\large \begin{align}
\sqrt{10}(\sqrt{5}+\sqrt{b})&=5\sqrt2+2\sqrt5 \\
\sqrt{10*5}+\sqrt{10b}&=\sqrt{25}\sqrt{2}+\sqrt{4}\sqrt{5}\\
\sqrt{50}+\sqrt{10b}&=\sqrt{50}+\sqrt{20}\\
\sqrt{50}+\sqrt{10b}-\sqrt{50}&=\sqrt{20}\\
\sqrt{10}*\sqrt{b}&=\sqrt{20}\\
\sqrt{b}&=\sqrt{\frac{20}{10}}\\
\sqrt{b}&=\sqrt{2}\\
b&=2
\end{align}\]
OpenStudy (zepp):
Correct! :)
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OpenStudy (anonymous):
thanks
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