(X + 5)(X -3)
X² +5X - 3X -15
X² +2X - 15
Por el dato:
(X + 5)(X -3) = X² + X +1
Igualando:
X² +2X - 15 = X² + X +1
2x -15 = X + 1
2X -X = 1 + 15
X = 16
RESPUESTA: 16
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(X + 5)(X -3)
X² +5X - 3X -15
X² +2X - 15
Por el dato:
(X + 5)(X -3) = X² + X +1
Igualando:
X² +2X - 15 = X² + X +1
2x -15 = X + 1
2X -X = 1 + 15
X = 16
RESPUESTA: 16