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OpenStudy (anonymous):
Which of the following quadratic functions has a graph that opens downward? More than one answer.. a. y=2x-x^2 b. y=1/3x^2-8x-13 c. y=2/3x^2-13x+5 d. y=-(3+x^2) Which of the following quadratic functions has a graph that opens downward? More than one answer.. a. y=2x-x^2 b. y=1/3x^2-8x-13 c. y=2/3x^2-13x+5 d. y=-(3+x^2) @Mathematics
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OpenStudy (anonymous):
the ones with negative "leading coefficients"
OpenStudy (anonymous):
so d.??
OpenStudy (chriss):
a and d
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