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OpenStudy (anonymous):
solve x^2-8x=-16 by completing the square. is it 4,4?
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OpenStudy (anonymous):
(x-2)^2
Directrix (directrix):
Yes, you have a double root because the parabola is tangent to the x-axis at (4,0).
Directrix (directrix):
(x-2)^2 = ? @michaelvelarde
OpenStudy (anonymous):
well anything you do to the left you have to do to the right so x^2-4x+4=-16+4
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