A quadratic function f is given by f(x)=x^2+4x . Select all of the statements that must be true about the graph of f. The graph opens downward. The graph has two x-intercepts. The y-intercept of the graph is at (0, 4). The vertex of the graph is at (-2, -4)

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A: Add the following question. 

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A: We have to find inverse of the given matrix. 

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A: solve

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Q: solution

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A: The square root principle says that, if c is a non-negative real number,

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