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Simplify (3n – 2m)2 = ? A. 6n2 – 12mn – 4m2 C. 9n2 + 12mn + 4m2 B. 9n2 – 12mn – 4m2 D. 9n2 – 12mn + 4m2
(3n – 2m)^2 = 9n^2 – 12mn + 4m^2
s
Question|Asked by masterquece
Asked 4/8/2014 4:56:53 AM
Updated 4/8/2014 7:17:17 AM
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(3n – 2m)^2 = 9n^2 – 12mn + 4m^2
Added 4/8/2014 7:17:17 AM
This answer has been confirmed as correct and helpful.
Confirmed by andrewpallarca [4/8/2014 7:21:54 AM]
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Updated 4/7/2014 7:12:35 AM
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Added 4/7/2014 7:12:35 AM
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Find the value of x in the equation 2(x – 3) + 5x = 5(2x + 6). A. 12 C. 2 B. –12 D. –2
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Question|Asked by masterquece
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Updated 4/8/2014 6:54:09 AM
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2(x – 3) + 5x = 5(2x + 6)
2x - 6 + 5x = 10x + 30
7x - 6 = 10x + 30
7x - 10x = 30 + 6
-3x = 36
x = -12
Added 4/8/2014 6:54:09 AM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [4/8/2014 7:06:32 AM]
Solve the system of equations 3r – 4s = 0 and 2r + 5s = 23. A. r = 12, s = 0 C. r = 4, s = 3 B. r = –12, s = 9 D. r = –1, s = –3
Question|Asked by masterquece
Updated 4/8/2014 8:04:28 AM
1 Answer/Comment
3r – 4s = 0, multiply 2 on both sides: 6r - 8s = 0 (equation 1)
2r + 5s = 23, multiply 3 on both sides: 6r + 15s = 69 (equation 2)
equation 2 - equation 1 we get: 23s = 69, s= 69/23 = 3
3r - 4(3) = 0, r = 12/3 = 4
The solution for the system of equations 3r – 4s = 0 and 2r + 5s = 23 is C. r = 4, s = 3
Added 4/8/2014 8:04:28 AM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [4/8/2014 8:05:49 AM]
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