1) (a+b)^2-(-c+d)^2=a^2+2ab+b^2-(d^2-2cd+c^2)=a^2+2ab+b^2-d^2+2cd-c^2
2) (a-b)^2-(-c+d)^2=a^2-2ab+b^2-(d^2-2cd+c^2)=a^2-2ab+b^2-d^2+2cd-c^2
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Answers & Comments
1) (a+b)^2-(-c+d)^2=a^2+2ab+b^2-(d^2-2cd+c^2)=a^2+2ab+b^2-d^2+2cd-c^2
2) (a-b)^2-(-c+d)^2=a^2-2ab+b^2-(d^2-2cd+c^2)=a^2-2ab+b^2-d^2+2cd-c^2