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The derivative of a sum of two or more functions is the sum of the derivatives of each function
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$\frac{d}{dl}\left(7l\right)+\frac{d}{dl}\left(5k\right)+\frac{d}{dl}\left(2lk\right)+\frac{d}{dl}\left(-l^2\right)+\frac{d}{dl}\left(-2k^2\right)$
Learn how to solve problems step by step online. Find the derivative d/dl(7l+5k2lk-l^2-2k^2) using the sum rule. 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'. Apply the product rule for differentiation: (f\cdot g)'=f'\cdot g+f\cdot g', where f=. The derivative of the constant function (7) is equal to zero.