Question

x^2 – c^2 – 2cd – d^2​

Answer 1

Answer:

x^2-c^2-2cd-d^2

x^2-(-c-d)^2

substitute a^2-b^2=a+b×a-b

(x+c+d)(x-c-d)

Answer 2

x^2 – c^2 – 2cd – d^2

x^ – c^2 – 2cd – d^2

x^2 – c^2 – 2cd – d^2

x^2 – c^2 – 2cd – d^2