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If m and n are respectively the order and degree of the differential equation :

(d2ydx2)5+6(d2ydx2)3d3ydx3+d3ydx3=x2+5\left(\frac{d^2 y}{dx^2}\right)^5 + 6 \frac{\left(\frac{d^2 y}{dx^2}\right)^3}{\frac{d^3 y}{dx^3}} + \frac{d^3 y}{dx^3} = x^2 + 5, then :

Solution

✅ Correct Option: 3

Highest order derivative is d3ydx3\frac{d^3 y}{dx^3}, so order m=3m = 3. Multiplying through by d3ydx3\frac{d^3 y}{dx^3} to clear the fraction yields a polynomial equation in derivatives, where the highest power of d3ydx3\frac{d^3 y}{dx^3} becomes 2. Hence degree n=2n = 2.

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