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Mathematics 13 Online
OpenStudy (anonymous):

solve using the quadratic formula x^2 -9 =0

OpenStudy (anonymous):

help

Directrix (directrix):

* x= + 9 or -9 should be + 3 or - 3

Directrix (directrix):

@treveno --> Do you still want to do this by the QF? (quadratic formula)

OpenStudy (anonymous):

Sorry good answer Directrix.

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