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OpenStudy (anonymous):
find the x-intercepts of the parabola with vertex (1,245) and y-intercept (0,240).
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OpenStudy (mathmate):
hint: start with y=a(x-h)^2+k vertex is when x=h. This allows you to solve for k. y-intercept is value of y when x=0, this lets you solve for a. Hence solve for the quadratic in x to find the zeroes (x-intercepts).
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