Question

Find the square of 39 without actual multiplication explain

Answer 1

Hey there!

39 can be written as ( 40 - 1).

(40 - 1)²

= (40)² + 1² - 2 * 40 * 1

= 1600 + 1 - 80

= 1521

Answer 2

Answer:

hi!

here is your answer!

(40-1)^2

(a-b)^2 = a^2-2ab+b^2

(40)^2-2*40*1+(1)^2

1600-80+1

=1521

hope it helps you!

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