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miah
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miah
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@SandeepReddy

SandeepReddy
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what is (a+b)*(c+d) ?

miah
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uhm ?

SandeepReddy
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what is the result of ( a+b)*(c+d) ?

tejadab268
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dw:1363810206819:dw

miah
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something with a fraction

SandeepReddy
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\[a*(b+c) = a*b+a*c \]

SandeepReddy
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@tejadab268 No direct answers please, explain them instead!

miah
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his answer wasnt even right

SandeepReddy
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In the same way \[(a+b)*(c+d) = a*(c+d)+b*(c+d)\]

SandeepReddy
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that is a*c+a*d+b*c+b*d

tejadab268
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So be it.......

SandeepReddy
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now for help1, help2 and help4 you can use above formulae that i hav given

miah
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but Idk how to do it

SandeepReddy
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dw:1363810963051:dwdw:1363811076093:dw

SandeepReddy
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GOt it ?@miah

miah
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yes, kind of. I was going to chose that answer. so the second one ?

tejadab268
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@SandeepReddy Good Explanation....... And I see I wasn't wrong ;)
FOIL METHOD?

miah
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sorry :P
can you help with the second one ?

SandeepReddy
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haha @tejadab268

SandeepReddy
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Do it yourself @miah now u know how to do these kind of problem , give it a try! you can do it , its simple than we think!

miah
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I still dont know how to do it

SandeepReddy
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Remember \[(a+b)(ab) = a^2 b^2\]

SandeepReddy
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Its very important as important as \[(a+b)^2 = a^2+2ab+b^2\]

SandeepReddy
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dw:1363812124287:dw

miah
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I got it right!

SandeepReddy
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as for as rationalizing problem is concerned, multiply numerator and denominator with root 2

SandeepReddy
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Now one problem left, can u do it urself?

miah
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wait,.. no i didnt ?

miah
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what answer choice is that ?

miah
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wait. i did get it right (:

miah
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I need help with the third one :o

miah
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3√2/2

SandeepReddy
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yes correct!