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Roots

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Manager
Manager
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Joined: 22 Sep 2008
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Roots [#permalink] New post 29 Sep 2008, 06:54
I think these are easy question , but just beat the time

q1: √98 + √18 = ?

√116

10 √4

10 √2

14

2 √29

q2:√112 − √63 + √28 = ?

√77

9 √7

9 √3

7 √3

3 √7

q3:√7 (7 √20 − 7 √75) = ?

14 √5 − 35 √3

5 √14 − 3 √35

35 √5 − 14 √3

35 √35 − 14 √21

14 √35 − 35 √21
Director
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Schools: Wharton
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Re: Roots [#permalink] New post 29 Sep 2008, 07:20
q1: √98 + √18 = ?

√116

10 √4

10 √2

14

2 √29


sqrt(98) + sqrt(18)
= sqrt(2*49) + sqrt(2*9)
= 7sqrt(2) + 3sqrt(2)
= 10sqrt(2)



q2:√112 − √63 + √28 = ?

√77

9 √7

9 √3

7 √3

3 √7


sqrt(112) - sqrt(63) + sqrt(28)
= sqrt(16*7) - sqrt(9*7) + sqrt(4*7)
= 4sqrt(7) - 3sqrt(7) + 2sqrt(7)
= 3sqrt(7)


q3:√7 (7 √20 − 7 √75) = ?

14 √5 − 35 √3

5 √14 − 3 √35

35 √5 − 14 √3

35 √35 − 14 √21

14 √35 − 35 √21

sqrt(7)*[7sqrt(20) - 7sqrt(75)]
=7sqrt(7)*[sqrt(4*5) - sqrt(25*3)]
= 7sqrt(7)*[2sqrt(5) - 5sqrt(3)]
= 14sqrt(35) - 35sqrt(21)
VP
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Re: Roots [#permalink] New post 29 Sep 2008, 08:47
Agree with zooink.

Zooink,

Can you tell me how to generate the sqrt? Do you write the tags or can you click some where and generate such mathematical symbols?
Manager
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Re: Roots [#permalink] New post 29 Sep 2008, 11:31
I think zoolink has copied answer from somewhere..
his answer is in image form..

but nice explanation

Thanks
Director
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Re: Roots [#permalink] New post 29 Sep 2008, 11:47
icandy wrote:
Agree with zooink.

Zooink,

Can you tell me how to generate the sqrt? Do you write the tags or can you click some where and generate such mathematical symbols?


Use the [m ] [/m ] brackets to offset math symbols.
Re: Roots   [#permalink] 29 Sep 2008, 11:47
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