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$\frac{d}{dx}\left(-x^2-7x+9\right)$
Learn how to solve problems step by step online. Find the derivative d/dx(x^2-x-2x^2-6x+9) using the sum rule. Simplifying. The derivative of a sum of two or more functions is the sum of the derivatives of each function. Apply the product rule for differentiation: (f\cdot g)'=f'\cdot g+f\cdot g'. The derivative of the constant function (-1) is equal to zero.