ICSE Class 9 Answered
(x+1)(x+2)(x+3)(x+4)-3 please factorise this
Asked by shahidbaba874 | 26 Sep, 2018, 09:44: PM
Expert Answer
(x+1)(x+2)(x+3)(x+4)-3
=[(x+1)(x+4)][(x+2)(x+3)]-3
= (x2 + 5x + 4) (x2 + 5x + 6) - 3
Put x2 + 5x = a
=(a + 4) (a + 6) - 3
=a2 + 10a + 24 - 3
=a2 + 10a + 21
=(a + 7)(a + 3)
Resubstitute the value of a, we get
=(x2 + 5x + 7)(x2 + 5x + 3)
Answered by Yasmeen Khan | 27 Sep, 2018, 11:12: AM
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