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in Calculus by (15 points)
edited by

If y =e3x +x2 , then prove that d2 y÷ dx2 -2 =9(y-x2)

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1 Answer

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by (18.1k points)

y = e3x + x2

⇒ \(\frac{dy}{dx}\) = 3e3x + 2x

⇒ \(\frac{d^2y}{dx^2}\) = 9e3x + 2

⇒ \(\frac{d^2y}{dx^2}\) - 2 = 9e3x

⇒ \(\frac{d^2y}{dx^2}\) - 2 = 9(y - x2) (∵ y = e3x + x2 ⇒ e3x = y - x2)

Hence, proved.

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