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Mathematics 17 Online
OpenStudy (anonymous):

f(x)=-2x²+4x+11 a)Complete the square to determine the vertex of the parabola. b)Use the quadratic formula to find the x-intercept of this graph. I got to f(x)=-2x²+4x+4+11-4 on part a but I don't know how to finish it with factoring and all that

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