Question
Mathematics Question on integral
If, y=9x+x+x+....∞ find dydx at a point where y = 3.
A
(A) 3
B
(B) -3
C
(C) -6
D
(D) -9
Answer
(B) -3
Explanation
Solution
Explanation:
y2=9(x+y)2y(dydx)=9+9(dydx)(dydx)=92y−9Now putting y = 3 we get dydx=−3Hence, the correct option is (B).