Q. 3 D5.0( 4 Votes )

# Foctorise the following:

x^{2} + 4x – 21

Answer :

⇒ x^{2} + 4x – 21

⇒ x^{2} + 7x - 3x – 21

⇒ x(x + 7) – 3(x + 7)

⇒ (x + 7)(x – 3)

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