Respuesta :

Answer:

x = 3, -1

Step-by-step 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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