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OpenStudy (anonymous):
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OpenStudy (anonymous):
What shpuld be added to x^2+bx to complete the square
Directrix (directrix):
Take half the coefficient of the x term and square it to get the third term.
Directrix (directrix):
x^2 +bx + b^2/4 (1/2) * b = b/2 (b/2)^2 = b^2 /4 @imuropheliac
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