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Expand the expression $\left(a+3\right)^2$ using the square of a binomial
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$(a+b)^2=a^2+2ab+b^2$
Learn how to solve special products problems step by step online. Expand the expression (a+3)^2. Expand the expression \left(a+3\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 3. Take the square of the second term: 3.