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Solution.

Given equation is 15 = -y^{2} - 3

Converting given equation into Standard Form of Quadratic Equation. ax^{2} + bx + c = 0

15 = -y^{2} - 3 converted into x^{2} + 0x + 18 = 0

Comparing it with the standard Form of Quadratic Equation ax^{2} + bx + c = 0

As we know, discriminant = b^{2} - 4ac

Discriminant = (0)^{2} - 4(1)(18)

Discriminant = 0 - (72)

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