Question

find the square of the number 39
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Answer 1

Step-by-step explanation:

Consider the given number.

39

We know that

(a-b)² = a²+b²-2ab

Therefore,

(40-1)² = (40)²+1²-2×40×1

(39)² = 2600+1-80

(39)² = 1521 ans.