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OpenStudy (anonymous):
write the equation of the quadratic function with roots -2 and 4 and a vertex at (1,9)
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OpenStudy (anonymous):
@primeralph
OpenStudy (jdoe0001):
|dw:1389402020417:dw| so... where do you think the parabola is going towards? upwards or downwards?
OpenStudy (anonymous):
right, up wards?
OpenStudy (jdoe0001):
the roots, so-called, are where the graph TOUCHES the x-axis, or x-intercepts notice the vertex is up above both... so .. anyhow |dw:1389402443282:dw| the vertex form of a parabola is http://www.mathwarehouse.com/geometry/parabola/images/standard-vertex-forms.png
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