Question

Qual a raiz da equação X²+5X-14=0 ?

a) (2, 7) b) (7, –2)
c) (–2, –7) d) (5, 14)
e) (2, –7)

Answer 1

e) Hence 2, -7 are roots of the equation X² + 5X - 14 = 0

Explanation:

given equation : X² + 5X - 14 = 0

⇒ X² + 7X - 2X - 14 = 0

⇒ X·(X + 7) - 2·(X + 7) = 0

⇒ (X + 7)·(X - 2) = 0

⇒ X = -7, X = 2

Hence 2, -7 are roots of the equation X² + 5X - 14 = 0