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og math 49

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by resilient » Tue Feb 05, 2008 9:46 pm
(root 7 + root 7)^2

I can understand the solution in the book but feel my answer is right also

a. 98
b.49
c.28
d.21
e.14

qa is c
but i cant seem to explain why e is wrong.
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Re: og math 49

by Neo2000 » Tue Feb 05, 2008 11:23 pm
Enginpasa1 wrote:(root 7 + root 7)^2

oa is c
but i cant seem to explain why e is wrong.
Root7 +Root7 = 2Root7

This whole squared = 4(7) = 28
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by sibbineni » Wed Feb 06, 2008 4:05 am
(sqrt7+sqrt7)^2

add up the square roots...

(2*sqrt7)^2

4*7

=28
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by Stuart@KaplanGMAT » Wed Feb 06, 2008 11:13 am
Just to show all the steps:

(root7 + root7)^2

(2 * root7)^2

(2^2) * ((root7)^2)

4 * 7

28
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Re: og math 49

by farooq » Fri Oct 30, 2009 7:33 am
resilient wrote:(root 7 + root 7)^2

I can understand the solution in the book but feel my answer is right also

a. 98
b.49
c.28
d.21
e.14

qa is c
but i cant seem to explain why e is wrong.
(a+b)^2 = a^2 + b^2 + 2ab
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