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Combining like terms $4r$ and $9r$
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$derivdef\left(13r-11r+7r\right)$
Learn how to solve differential calculus problems step by step online. Find the derivative of 4r+9r-11r7r using the definition. Combining like terms 4r and 9r. Combining like terms 13r and -11r. Combining like terms 2r and 7r. Find the derivative of 9r using the definition. Apply the definition of the derivative: \displaystyle f'(x)=\lim_{h\to0}\frac{f(x+h)-f(x)}{h}. The function f(x) is the function we want to differentiate, which is 9r. Substituting f(x+h) and f(x) on the limit, we get.