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When multiplying two powers that have the same base ($a+4$), you can add the exponents
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$\left(a+4\right)^2$
Learn how to solve special products problems step by step online. Solve the product (a+4)(a+4). When multiplying two powers that have the same base (a+4), you can add the exponents. Expand the expression \left(a+4\right)^2 using the square of a binomial. Take the square of the first term: a. Twice (2) the product of the two terms: a and 4.