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range of this quadratic expression

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Exhibit the vertex and y-intercept for the quadratic expression y = x^2 - 4 .

How many zeros does this expression have? Exhibit those ordered pairs which constitute these zeros.

What is the range of this quadratic expression?

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The range of this quadratic expression is determined in the solution.

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The vertex of the parabola y=ax^2+bx+c is at x=-b/(2a). In this case we have a=1, b=0, c=-4, so the vertex is at ...

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