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`        Factorize: (x + 1)(x + 3)(x + 5)(x + 7) + 15`
7 years ago

147 Points
```										Dear ajinkya
(x +  1)(x + 3)(x + 5)(x + 7) + 15
=(x +  1)(x + 7)(x + 5)(x + 3) + 15
=(x2+8x+7)(x2+8x+15) + 15
let x2+8x+7 = t
=t(t+8) + 15
=t2 + 8t + 15
=(t+5)(t+3)
now put the value of t and factorise
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```
7 years ago
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