Answer:
x = 3, -1
Explanation:
By Middle term splitting,
=> -x² + 2x + 3 = 0
=> -x² + 3x - x + 3 = 0
=> -x (x - 3) -1 (x - 3) = 0
=> (x - 3) (-x -1) = 0
=> x = 3, -1
Hope it helps.
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