Question

21^2-19^2=_______
(58+42)(58-42)=______​

Answer 1

Answer:

4

1600

Step-by-step explanation:

as the powers are equal hence we can

subtract the numbers without worrying about the powers hence it can be written as

=(21-19)^2

=2^2

=4

first solve the part in the bracket hence it would be -

=(100)(16)

=1600