Question

Решите c^2+2c-d^2+2d

Answer 1

c²+2c-d²+2d=

=(c-d)*(c+d)+2(c+d)=

=((c-d)+2)*(c+d)=

=(c-d+2)*(c+d).

Answer 2

c^2+2c-d^2+2d =
(c-d)(c+d) + 2 (c+d) =
(2+c-d)(c+d).