There are infininte combinations. One condition must be true though: x is the opposite of y (x is the negative of y) or vice versa.
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(0, -14)
x2 + 49 = 0 ∴ x2 = -49 ∴ x = 7i
It is x = -5
x = 0 or x = 2
2p2-5p+2 = 0 (2p-1)(p-2) = 0 p = 1/2 and p = 2