evansk825 evansk825

26-01-2018
Mathematics

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What number must you add to complete the square? x2 + 22x = 9

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choixongdong choixongdong

26-01-2018

x^2 + 22x + 121 = 9 + 121 ..............a^2 + 2ab + b^2 = (a+b)^2

(x + 11)^2 = 130

answer

you must add 121 to complete the square

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