Determine an expression of the quadratic function
1) Determine an expression of the quadratic function whose graph through point (1, 3) and has the vertex (-1, -5).
2) If whole graph of quadratic function y = x^2 - (k+1)x + 2k is located above x-axis, determine condition of number k.
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Determine an expression of the quadratic function whose graph through point (1, 3) and has the vertex (-1, -5). If whole graph of quadratic function y = x^2 - (k+1)x + 2k is located above x-axis, determine condition of number k.
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