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Expand the expression $\left(x+3\right)^2$ using the square of a binomial
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$(a+b)^2=a^2+2ab+b^2$
Learn how to solve definite integrals problems step by step online. Simplify the expression 3(x-1)-(-x^2+2x+8)=(x+3)^2. Expand the expression \left(x+3\right)^2 using the square of a binomial. Take the square of the first term: x. Twice (2) the product of the two terms: x and 3. Take the square of the second term: 3.