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Using the formula (a – b)2=(a2 – 2ab + b2), evaluate (891)2. |
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Answer» Given (891)2 We have (a – b)2 = (a2 – 2ab + b2)(891)2 can be written as 900-9 So here a=900 and b=9 Using the formula, (900 – 9)2 = (9002 – 2 X 900 X 9 + 92) On simplifying we get (900 – 9)2 = (810000 – 16200 +81) (891)2 = 793881 |
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