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The order of the differential equation $d^3y/dx^3 + (d^2y/dx^2)^2 + y = 0$ is:
A$2$, equal to the degree of the highest derivative shown
B$1$, equal to the degree of $y$ on the chart here always
C$3$, the order of the highest derivative present in the DE
D$5$, summing all orders on the school chart at one time
Answer & Solution
Correct answer: C. $3$, the order of the highest derivative present in the DE
Order = order of the highest derivative = 3.
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