Q. 3 D5.0( 4 Votes )
Foctorise the following:
x2 + 4x – 21
Answer :
⇒ x2 + 4x – 21
⇒ x2 + 7x - 3x – 21
⇒ x(x + 7) – 3(x + 7)
⇒ (x + 7)(x – 3)
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