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When multiplying two powers that have the same base ($x$), you can add the exponents
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$x^2+9x+18$
Learn how to solve problems step by step online. Factor by completing the square xx+9x+18. When multiplying two powers that have the same base (x), you can add the exponents. Add and subtract \displaystyle\left(\frac{b}{2a}\right)^2. Factor the perfect square trinomial x^2+9x+\frac{81}{4}. Subtract the values 18 and -\frac{81}{4}.