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# Roots

Author Message
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Manager
Joined: 22 Sep 2008
Posts: 123
Followers: 1

Kudos [?]: 38 [0], given: 0

Roots [#permalink]  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
Joined: 12 Jul 2008
Posts: 518
Schools: Wharton
Followers: 16

Kudos [?]: 122 [0], given: 0

Re: Roots [#permalink]  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
Joined: 05 Jul 2008
Posts: 1431
Followers: 35

Kudos [?]: 260 [0], given: 1

Re: Roots [#permalink]  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
Joined: 22 Sep 2008
Posts: 123
Followers: 1

Kudos [?]: 38 [0], given: 0

Re: Roots [#permalink]  29 Sep 2008, 11:31
his answer is in image form..

but nice explanation

Thanks
Director
Joined: 12 Jul 2008
Posts: 518
Schools: Wharton
Followers: 16

Kudos [?]: 122 [0], given: 0

Re: Roots [#permalink]  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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