SOLUTION: can you please help me to answer this queation its all abot the completing square x2-8x+15=0

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Question 185789: can you please help me to answer this queation its all abot the completing square x2-8x+15=0
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E2-8x%2B15=0
x%5E2-8x+=+-15 take half of 8 to get 4. then square that to get 16. Then add 16 to both sides
x%5E2+-8x+%2B+16+=+-15+%2B+16
%28x-4%29%5E2+=+1
Take square root of both side
(x-4) = 1 or (x-4) = -1
x = 5 or x = 3