Explicație pas cu pas:
P(X) = X² + 2X - 15 = X² + 5X - 3X - 15 = X(X + 5) - 3(X + 5) = (X + 3)(X - 5)
X = -5
X = 3
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Explicație pas cu pas:
P(X) = X² + 2X - 15 = X² + 5X - 3X - 15 = X(X + 5) - 3(X + 5) = (X + 3)(X - 5)
X = -5
X = 3