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X2 - 8X = 3
halve the linear term (- 8 ), square it and add it to both sides
X2 - 8X + 16 = 3 + 16
factor left, gather terms right
(X - 4)2 = 19
(X - 4)2 - 19 = 0
-------------------------
(4, - 19)
----------------the vertex
16 is the number that needed to be added to both sides to complete the square
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Earn +20 ptsQ: What number must you add to complete the square x2-8x equals 3?
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