a is positive. Graph has a U shape.
c is equal to f(0). c is negative.
We know that x=-b/(2a)(foci) is positive and a is positive.
Hence b is negative.
a positive b and c negative
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a is positive. Graph has a U shape.
c is equal to f(0). c is negative.
We know that x=-b/(2a)(foci) is positive and a is positive.
Hence b is negative.
a positive b and c negative