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Q.

The range of the y=9−x2 is

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a

9,∞

b

(9,∞)

c

0,3

d

(3,∞)

answer is C.

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Detailed Solution

9−x2 Least value of square root is 0 when 9−x2=0 or x=±3 Also, greatest value of 9−x2 is 9 when x=0 .  Hence we have 0≤9−x2≤9⇒9−x2∈[0,3]
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