Question

B)1) Find the square of 42 without actual multiplication.​

Answer 1

Answer:

Consider the given number.

42

 

We know that

(a+b)2=a2+b2+2ab

 

Therefore,

(40+2)2=(40)2+22+2×40×2

(42)2=1600+4+160

(42)2=1764

 

Hence, this is the answer.

Answer 2

Answer:

We need to square the number 42.

We can use the identity: (a+b)2 = a2 + b2 + 2ab, to find the square of 42.

Therefore, the square of 42 is 1764.