Given the values of a, b, and c, write the quadratic equation in the form of 2 + + = 0 and determine the nature of its roots.
1) a = 1 b = 0 c = -3
2) a = 3 b = -6 c = -5
3) a = 1 b = 7 c = -9
4) a = 4 b = 0 c = -9
5) a = 2 b = -8 c = 0
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