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OpenStudy (anonymous):
Write the equation of the quadratic function with roots -10 and -8 and a vertex at (-9, -3)
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OpenStudy (campbell_st):
well use the roots to get the factors \[y =a(x +10)(x+8)\] a is a constant... so distribute to get the quadratic then substitute x = -9 and y = -3 to find the value of a
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