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| 1. |
Factorise each of the following : (i) 27y3 + 125z3 (ii) 64m3 – 343n3 |
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Answer» (i) 27y3 + 125z3 = (3y)3 + (5z)3 = (3y + 5z) {(3y)2 – (3y)(5z) + (5z)2} = (3y + 5z) (9y2 – 15yz + 25z2) (ii) 64m3 – 343n3 = (4m)3 – (7n)3 = (4m – 7n) {(4m)2 + (4m) (7n) + (7n)2} = (4m – 7n) (17m2 + 28mn + 49n2) |
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