Выполните умножение: 1) (5а^2-3b)(5а^2+3b)= 2) (4m^2+6n)(4m^2-6n)=

Question

Выполните умножение:

1) (5а^2-3b)(5а^2+3b)=

2) (4m^2+6n)(4m^2-6n)=

Answer 1

1) (5а^2-3b)(5а^2+3b)=25a^4+15a^2b-15a^2b-9b^2=25a^4-9b^2

 

2) (4m^2+6n)(4m^2-6n)=16m^4-24m^2n+24m^2n-36n^2=16m^4-36n^2

Answer 2

(5а^2-3b)(5а^2+3b)=25b^4 - 9b^2

(4m^2+6n)(4m^2-6n)=16m^4 - 36n^2