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A parabola opens down if the value of “blank” is negative in the general form of the equation
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A parabola opens down if the value of “blank” is negative in the general form of the equation

User Kamoor
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If the value of "a" is negative

User John Atwood
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General form:
ax² + bx + c = 0

If the leading coefficient "a" is negative the parabola opens downward.
User Lindel
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