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Question: Answered & Verified by Expert
If ey+xy=e, the ordered pair dydx,d2ydx2 at x=0 is equal to
MathematicsDifferentiationJEE MainJEE Main 2019 (12 Apr Shift 1)
Options:
  • A -1e,-1e2
  • B -1e,1e2
  • C 1e,-1e2
  • D 1e,1e2
Solution:
1714 Upvotes Verified Answer
The correct answer is: -1e,1e2

ey+xy=e

differentiate w. r. t. x

eydydx+xdydx+y=0

dydxx+ey=-y, dydx(0,1)=-1e

Again differentiate w. r. t. x

ey.d2ydx2+dydx.ey.dydx+x.d2ydx2+dydx+dydx=0

x+eyd2ydx2+dydx2.ey+2dydx=0

Now, at 0,1

ed2ydx2+1e2e+2-1e=0

d2ydx2=1e2

Hence, ordered pair dydx,d2ydx2=-1e,1e2

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