Mathematics
OpenStudy (anonymous):

simplify: 3 square root of 45 minus 2 square root of 125

OpenStudy (anonymous):

$3\sqrt{45}-2\sqrt{125}$

OpenStudy (anonymous):

and simplify this $(-27)^{-1/3}$

OpenStudy (anonymous):

$3\sqrt{9*5}-2\sqrt{25*5}$ $3*3\sqrt{5}-2*5\sqrt{5}$ $9\sqrt{5}-10\sqrt{5}$= $-1\sqrt{?}$

OpenStudy (anonymous):

thats is suppose to be $-1\sqrt{5}$

OpenStudy (anonymous):

and have you tried simplifying that other one?

OpenStudy (anonymous):

not yet.

OpenStudy (anonymous):

can you simplify it?

OpenStudy (anonymous):

sure i can

OpenStudy (anonymous):

Please and thank you, sir :)

OpenStudy (anonymous):

first of all realize that we can write this problem as : $1/\sqrt[3]{-27}$

OpenStudy (anonymous):

and answer is -1/3

OpenStudy (anonymous):

thank you :)

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