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OpenStudy (anonymous):
how do I identify the min/max value of f(x)=-x^2-4x? I found x=2 and y=-4
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OpenStudy (zale101):
x=2 and y=-4 was that the vertex you found?
OpenStudy (zale101):
all you have to look is at the negative sign at the front of the equation, if it existed than it's a sad face parabola. If it didn't then it's a happy faced parabola|dw:1411966234760:dw|.
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