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Factorise:9y2 – 66yz + 121z2 |
Answer» 9y2 − 66yz + 121z2 Using (a − b)2 = a2 + b2 − 2ab = (3y)2 + (11z)2 − 2 × 3y × 11 = (3y − 11z)2 |
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