Q.

If  the rate of decrease of x22−2x+5  is thrice the decrease of  x  then x =

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a

2

b

3

c

5

d

1

answer is C.

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Detailed Solution

y=x22−2x+5           dydt=(x−2)dxdt           3dxdt=(x−2)dxdt   ⇒x=5
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Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
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If  the rate of decrease of x22−2x+5  is thrice the decrease of  x  then x =