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If y = x + 2x2 + 7x + 8then dy/dxwill be -​

Answer»

y = x + 2 \times 2 + 7x + 8 \\ y = x + 4 + 7x + 8 \\ = > \frac{dy}{dx} = \frac{d}{dx} (x + 4 + 7x + 8) \\ = > \frac{dy}{dx} = \frac{d}{dx} x + \frac{d}{dx} 4 + \frac{d}{dx} 7x + \frac{d}{dx}8 \\ = > \frac{dy}{dx} = 1 + 0 + 7 + 0 \\ = > \frac{dy}{dx} = 8

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