Question

evaluation. ........​

Answer 1

Answer:

the square of 87 is 7569

and

the square of 87 is 7396

we will separate both= 7569 - 7396

answer is 173

Answer 2

Answer:

a²-b²= a+b

given:-

87²-86²=87+86=173

so, 87²-86²=173

hope it will be helpful