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Mathematics 7 Online
OpenStudy (anonymous):

I need help with radicals :(

OpenStudy (anonymous):

?

OpenStudy (anonymous):

\[(3\sqrt{2} + \sqrt{3})(\sqrt{2} - 5\sqrt{3})\]

OpenStudy (anonymous):

aren't they wanted by the FBI and CIA?

OpenStudy (anonymous):

ok... i guess not funny... Let's just FOIL it out...

OpenStudy (anonymous):

okay

OpenStudy (anonymous):

F (first): 3sqrt2 * sqrt2 = 3*2 = 6 O (outside): 3sqrt2 * -5sqrt3 = -15sqrt6 I (inside): sqrt3 * sqrt2 = sqrt6 L (last): sqrt3 * -5sqrt3 = -5*3 = -15

OpenStudy (anonymous):

okay

OpenStudy (anonymous):

now add those all up... 6 - 15 - 15sqrt6 + sqrt6 = -9 - 14sqrt6

OpenStudy (anonymous):

okay thank so much

OpenStudy (anonymous):

yw...

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