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Exercise 6.2 · Q16

Q.Obtain the differential equation by eliminating the arbitrary constants: y=c1e3x+c2e2xy=c_1e^{3x}+c_2e^{2x}

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y=c1e3x+c2e2xy=c_1e^{3x}+c_2e^{2x} has two arbitrary constants, with characteristic roots 33 and 22, so it solves d2ydx2−(3+2)dydx+(3)(2)y=0\dfrac{d^2y}{dx^2}-(3+2)\dfrac{dy}{dx}+(3)(2)y=0. Checking directly: dydx=3c1e3x+2c2e2x\dfrac{dy}{dx}=3c_1e^{3x}+2c_2e^{2x}, d2ydx2=9c1e3x+4c2e2x\dfrac{d^2y}{dx^2}=9c_1e^{3x}+4c_2e^{2x}. Using the three equations in c1e3x,c2e2xc_1e^{3x},c_2e^{2x} (as in the chapter …

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