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If a²+b²=74 and ab=10 find the value of (a-b)²​

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Answer:

54

Explanation:

(a -b)²

= a² -2ab +b²

= a² +b² -2ab

= 74 -2(10) (subst. value of a²+b² and ab)

= 74 -20

= 54

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