Question

without actual squaring find the value 1) 21square -20 square ..1) 34square-33 square

Answer 1

21square - 20 square
(21+20)(21-20)
41*1=41

Answer 2

Answer:

1) 21²-20²

here we will apply a²-b²

a²-b²=(a+b)(a-b)

21²-20²=(21+20)(21-20)

=41×1

=41

2) 34²-33²

here also we will apply the same

a²-b²=(a+b)(a-b)

34²-33²=(34+33)(34-33)

=67×1

=67

hope it helps