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The mean of 3 numbers 2x, 7x and x2 is 12, where x < 0. What is the r
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20 Oct 2024, 23:15
20 Oct 2024, 23:15
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Question Stats:
75% (02:17) correct
25% (02:04) wrong based on 4 sessions
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The mean of 3 numbers 2x, 7x and \(x^2\) is 12, where x < 0. What is the range of the given 3 numbers?
A. 84
B. 144
C. 176
D. 228
E. 256
A. 84
B. 144
C. 176
D. 228
E. 256
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Re: The mean of 3 numbers 2x, 7x and x2 is 12, where x < 0. What is the r
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21 Oct 2024, 13:17
21 Oct 2024, 13:17
2
2x + 7x + x^2 = 36
9x + x^2 - 36 = 0
(x - 3)(x + 12) = 0
Since x < 0
x = -12
List becomes
-24, -84, 144
Range = 144 + 84
= 228
Answer D
9x + x^2 - 36 = 0
(x - 3)(x + 12) = 0
Since x < 0
x = -12
List becomes
-24, -84, 144
Range = 144 + 84
= 228
Answer D
gmatclubot
Re: The mean of 3 numbers 2x, 7x and x2 is 12, where x < 0. What is the r [#permalink]
21 Oct 2024, 13:17
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