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Expand the expression $\left(a+9\right)^2$ using the square of a binomial: $(a+b)^2=a^2+2ab+b^2$
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$derivdef\left(a^{2}+18a+81-2\left(a+9\right)\right)$
Learn how to solve integral calculus problems step by step online. Find the derivative of (a+9)^2-2(a+9) using the definition. Expand the expression \left(a+9\right)^2 using the square of a binomial: (a+b)^2=a^2+2ab+b^2. Multiply the single term -2 by each term of the polynomial \left(a+9\right). Add the values 81 and -18. Combining like terms 18a and -2a.