Question

(m+5)(m-5)
(2m+3)(2m-3)
(8x-9y)(8x+8y)
решите пожалуйста срочно!!!

Answer 1

m^2 -25
4m^2-9
64x^2-72y^2

Answer 2

m^2-5m+5m-25=m^2-25    
4m^2-6m+6m-9=0
4m^2-9=0
64х^2+64xy-72yx-72y^2=64x^2-8xy-72y^2