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Mathematics 8 Online
OpenStudy (anonymous):

Can someone please answer this for me. Write the equation of the quadratic function with roots -2 and 4 and a vertex at (1,9)

OpenStudy (agl202):

what do u think?

OpenStudy (agl202):

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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