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05 May 2016, 04:55
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A
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Difficulty:
45%
(medium)
Question Stats:
64% (00:47) correct
36%
(00:59)
wrong
based on 11
sessions
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What is the value of |a|+10?
(1) a^2 = 25
(2) a^3 = 25a
(1) a^2 = 25
(2) a^3 = 25a
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05 May 2016, 14:55
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Bunuel
(1) a^2 = 25
a = 5 or -5
|+/-5| + 10 = 15
Statement 1 is sufficient
(2) a^3 = 25a
a^3-25a = 0
a (a^2-25) = 0
a=0 --> |0|+10=10
or a=5 or a=-5 --> |+/-5|+10=15
Statement 2 is not sufficient
The answer is (A)
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05 May 2016, 15:23
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I knew there was probably a trick in statement 2 but cant it be rewritten
a^3 = 25a -----> a^2 *a = 25* a -------> divide both sides by a ------>a^2=25 (same as stmt 1)
D
a^3 = 25a -----> a^2 *a = 25* a -------> divide both sides by a ------>a^2=25 (same as stmt 1)
D
