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O. Factorise the following expression.
(i) 63a²_112b2
(ii) 92-10q+21
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i)p
2
+6p+8=p
2
+3×2p+9−9+8
=(p+3)
2
−1=(p+3−1)(p+3+1)
=(p+2)(p+4)
ii)q
2
−10q+21=q
2
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