Question

resolva o protudo a soma pela diferença dos itens abaixo

a. (x +5).(x-5)

b. ( x+2y).(x-2y)

c. (x+11).(x-11)

d. (2m-5).(2m+5)

Answer 1

a) (x+5).(x-5)= x²-5x+5x-25= x²-25

b) (x+2y).(x-2y)= x²-2xy+2xy-4y²= x²-4y²

c) (x+11).(x-11)= x²-11x+11x-121= x²-121

d) (2m-5).(2m+5)= 4m²+10m -10m -25= 4m²-25