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Which of the following correctly completes the square for the equation below? x2 - 9x = 0
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If you have x^2+18x=0 then you can write it as x^2+18x+81=81 since I've added 81 to both sides the equation is still complete. With x^2+18x+81 you can factor that down to (x+9)^2 since 9*2=18 and 9^2=81. Hence the whole thing is (x+9)^2=81 Dean M · 5
im confused
What are you confused about?
the whole thing
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