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Combining like terms $9x$ and $-2x$
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$derivdef\left(7x+4\right)$
Learn how to solve problems step by step online. Find the derivative of 9x-2x+4 using the definition. Combining like terms 9x and -2x. Find the derivative of 7x+4 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 7x+4. Substituting f(x+h) and f(x) on the limit, we get. Multiply the single term 7 by each term of the polynomial \left(x+h\right). Multiply the single term -1 by each term of the polynomial \left(7x+4\right).