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OpenStudy (anonymous):
Would the answer to completing the square x^2-8x+16=0 be x= + or - 4?
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OpenStudy (ybarrap):
plug in x=-4 and x=4 and see if the whole equation is equal to zero.
OpenStudy (ybarrap):
$$ (-4)^2-8(-4)+16=?\\ (4)^2-8(4)+16=?\\ $$
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