Question

find the square of 39 in expand form​

Answer 1

Answer:

$39 {}^{2} = 1521 \\ \ = 1000 + 500 + 20 + 1$

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Answer 2

Step-by-step explanation:

(39)²= (40-1)²

using (a-b)²=a²+b²-2ab

(40-1)²=(40)²+(1)²-2(40)(1)

(40-1)²=1600+1-80

(40-1)²=1521

So, (39)²=1521 is the answer

Hope this will help you!