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When multiplying two powers that have the same base ($x$), you can add the exponents
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$derivdef\left(x^2+9x+18\right)$
Learn how to solve problems step by step online. Find the derivative of xx+9x+18 using the definition. When multiplying two powers that have the same base (x), you can add the exponents. Find the derivative of x^2+9x+18 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 x^2+9x+18. Substituting f(x+h) and f(x) on the limit, we get. Expand \left(x+h\right)^2. Multiply the single term 9 by each term of the polynomial \left(x+h\right).