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29 Sep 2008, 07:54
Kudos
Bookmarks
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
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
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29 Sep 2008, 08:20
Kudos
Bookmarks
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
\(sqrt(7)*[7sqrt(20) - 7sqrt(75)]\\
=7sqrt(7)*[sqrt(4*5) - sqrt(25*3)]\\
= 7sqrt(7)*[2sqrt(5) - 5sqrt(3)]\\
= 14sqrt(35) - 35sqrt(21)\)
√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
\(sqrt(7)*[7sqrt(20) - 7sqrt(75)]\\
=7sqrt(7)*[sqrt(4*5) - sqrt(25*3)]\\
= 7sqrt(7)*[2sqrt(5) - 5sqrt(3)]\\
= 14sqrt(35) - 35sqrt(21)\)
29 Sep 2008, 09:47
Kudos
Bookmarks
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?
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?
