21a^3b^5
= 21b^3= 3b^3
35a^4b^2 35a 5a
6x^2*(x+y) 6x
= = 2x/3y
9xy*(x+y) 9y
5m-5n 5(m-n)
= = 5/mn
m^2n-mn^2 mn(m-n)
4a^2-9 (2a-3)(2a+3)
= = (2a-3)/5
10a+15 5(2a+3)
a^2-2ab+b^2
=
a^2-b^3
21a^3b^5
= 21b^3= 3b^3
35a^4b^2 35a 5a
6x^2*(x+y) 6x
= = 2x/3y
9xy*(x+y) 9y
5m-5n 5(m-n)
= = 5/mn
m^2n-mn^2 mn(m-n)
4a^2-9 (2a-3)(2a+3)
= = (2a-3)/5
10a+15 5(2a+3)
a^2-2ab+b^2
=
a^2-b^3