Question

Please tell this is right​

Answer 1

Both are correct dear.....good going
But in the last line
Multiply
10x with 3y
30xy

Answer 2

Answer:

First one is correct, second one should be :

$(5x + 3y)^{2}\\= (5x)^{2} + (3y)^{2} + 2*5x*3y\\= 25x^{2} + 9y^{2} + 30xy$