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Q.

If [y] denote the greatest integer < y, and 2x82+3x8=20 then x lies in the smallest interval [a, b) where b– a is equal to

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a

6

b

5

c

4

d

8

answer is D.

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Detailed Solution

2x82+3x8−20=0⇒x8=52 or −4As x8 is an integer, we takex8=−4 ⇒ −4≤x/8<−3⇒−32≤x<−24 Thus, a = – 32, and b = – 24. Therefore,  b – a = 8
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