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The derivative of a function multiplied by a constant is equal to the constant times the derivative of the function
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$-\frac{d}{dx}\left(\left(4-x\right)\left(x+1\right)\right)$
Learn how to solve problems step by step online. Find the derivative of -(4-x)(x+1). The derivative of a function multiplied by a constant is equal to the constant times the derivative of the function. Apply the product rule for differentiation: (f\cdot g)'=f'\cdot g+f\cdot g', where f=. The derivative of a sum of two or more functions is the sum of the derivatives of each function. The derivative of a sum of two or more functions is the sum of the derivatives of each function.