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21 May 2019, 02:28
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
78% (01:57) correct
22%
(02:21)
wrong
based on 195
sessions
History
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Time
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Not Attempted Yet
The function f is defined for all numbers x by f(x) = x^2 + x. If t is a number such that f(2t) = 30, which two of the following could be the number t?
I. -3
II. −1/2
III. 5/2
A. I only
B. II only
C. III only
D. I and III only
E. I, II and III
I. -3
II. −1/2
III. 5/2
A. I only
B. II only
C. III only
D. I and III only
E. I, II and III
21 May 2019, 02:36
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Bunuel
f(2t) = 30
—> (2t)^2 + 2t = 30
—> 4t^2 + 2t = 30
—> 2t^2 + t - 15 = 0
—> 2t^2 + 6t - 5t - 15 = 0
—> (2t - 5)(t + 3) = 0
—> t = 5/2, -3
Option D
Posted from my mobile device
21 May 2019, 02:45
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X^2+X = X(X+1)
F(2t)=2t(2t+1)
Plug the options given
1. t=-3 will give 30
3. t=5/2 will give 30
2. t=-1/2 will give 0
So 1 and 3 gives answer
Option D
Posted from my mobile device
F(2t)=2t(2t+1)
Plug the options given
1. t=-3 will give 30
3. t=5/2 will give 30
2. t=-1/2 will give 0
So 1 and 3 gives answer
Option D
Posted from my mobile device
