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OpenStudy (anonymous):
solve using the quadratic formula x^2 -9 =0
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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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