Question

(21x+13y)²,441x²-169y²
the one who will answer properly and fast I will mark as brainliest and verified answer which will give you 10000 points​

Answer 1

Answer:

Method of Solution;

1) (21x+13y)²

=> (21x)²+(13y)² +2.12x.13y

=>441x²+169y²+546xy

2) (21x-13y)²

=> (21x)²+(13y)²-2.21x.13y

=> 441x²+169y²-546xy

3) (21x-13y)(21x+13y)

=> (21x)²-(13y)²

=> 441x²-16y²