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OpenStudy (anonymous):
Show that 5 - 4x - x^2 can never be greater than 9.
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OpenStudy (anonymous):
Since this is a downward opeining parabola, look to find the vertex, (the x-coordinate) by using the formula -b/2a. Then plug this value into the original equation.
OpenStudy (anonymous):
The parabola can never be greater than tthat y-value
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