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# What is the value of x? (1) sq. root of x^4 = 9 (2) the

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What is the value of x? (1) sq. root of x^4 = 9 (2) the [#permalink]

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19 Dec 2004, 18:22
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19. What is the value of x?
(1) sq. root of x^4 = 9
(2) the average (arithmetic mean) of x^2 , 6x, and 3 is -2
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21 Dec 2004, 03:38

From (1) x=+/-3 Insuff.
from (2) x^2+6x+3=-6
(x+3)^2=0 => x=-3 Suff
21 Dec 2004, 03:38
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