Find the square of the 39 without actual multiplication
Answers
Answered by
121
(39)²
=> (39)²
=> (40-1)²
==============
By formula,
(a-b)²=a²+b²-2ab
==============
=> (40-1)²
=> (40)² + (1)² -2(40×1)
=> 1600 + 1 - 80
=> 1600-79
=> 1521
I hope this will help you
-by ABHAY
=> (39)²
=> (40-1)²
==============
By formula,
(a-b)²=a²+b²-2ab
==============
=> (40-1)²
=> (40)² + (1)² -2(40×1)
=> 1600 + 1 - 80
=> 1600-79
=> 1521
I hope this will help you
-by ABHAY
Answered by
30
Answer:
1521
Step-by-step explanation:
(39)^2
(40-1)^2)
(A-b)^2=a^2-2ab+b^2
40^2 -2×40×1 +1^2
1600-80+1= 1600-79
= 1521
Hence the required answer is 1521
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