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The order of the differential equation d²y/dx² + 3 dy/dx + 2y = 0 is
A0
B1
C2
D3
Answer & Solution
Correct answer: C. 2
1. Order = highest derivative appearing.
2. Here d²y/dx² is the highest derivative, of order 2.
3. Degree is 1 since it appears to the first power.
4. Hence the order is 2.
_Source: Maharashtra Balbharati Std XII Mathematics & Statistics (Commerce), Ch 9 "Differential Equations", §9.1 ¶§9.1_
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