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Explain how you can tell wether the graph of a quadratic function opens up or down

User Primehalo
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If the function is already in the form of y = ax²+bx+c, then all you have to do is look at "a". If it "a" is positive, then it will open up(look like a U) if "a" is negative, then it will open down(look like an upside down U)
User Vertisan
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