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OpenStudy (anonymous):
Find the point (x, y) at which the graph of y=5x^2+7x-7 has a horizontal line.
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OpenStudy (zpupster):
this quadratic equation (ax^2+bx+c ) would have a horizontal line at its vertex. the formula to find the x of the vertex is x = -b/2a from you can compare the graph of x^2
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