NDA Maths Mock Test – 01 – Q101

Question:

Forming a differential equation representing the given family of curves by eliminating arbitrary constants a and b from y = e2x (a + bx) yields the differential equation

Forming a differential equation representing the given family of curves by eliminating arbitrary constants a and b from y = e2x (a + bx) yields the differential equation

Options:

  • y” + 4y’ + 4y = 0
  • y” + 4y’ – 4y = 0
  • y” – 4y’ + 4y = 0
  • y” – 4y’ – 4y = 0
  • y” + 4y’ + 4y = 0
  • y” + 4y’ – 4y = 0
  • y” – 4y’ + 4y = 0
  • y” – 4y’ – 4y = 0

Correct Answer: c)

Explanation:

‘ eXy=a+bz
er W gery —p
d
e*(F-2)=b
d* d. d;
\ FG 2g) ~ 2 (EL —-2y)=0 1
dy dy
\ w= 4a ty=0

‘ eXy=a+bz
er W gery —p
d
e*(F-2)=b
d* d. d;
\ FG 2g) ~ 2 (EL —-2y)=0 1
dy dy
\ w= 4a ty=0

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