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Multiply $-1$ times $-1$
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$derivdef\left(8+1\right)$
Learn how to solve problems step by step online. Find the derivative of 8-*- using the definition. Multiply -1 times -1. Add the values 8 and 1. Find the derivative of 9 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 9. Substituting f(x+h) and f(x) on the limit, we get. Subtract the values 9 and -9.