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(x+3)² = (x+3)(x+3) When we distribute polynomials, we have to make sure each term mutliplies to all of the terms in the other polynomial. x(x+3) + 3(x+3) x² + 3x + 3x + 9 x² + 6x + 9 Methods such as FOIL (first, outside, inside, last) and creating a table can help you with this.
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