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Add and subtract $\displaystyle\left(\frac{b}{2a}\right)^2$
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$x^2-8x+9+16-16$
Learn how to solve problems step by step online. Factor by completing the square x^2-8x+9. Add and subtract \displaystyle\left(\frac{b}{2a}\right)^2. Factor the perfect square trinomial x^2+-8x+16. Subtract the values 9 and -16.