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b. (a+b+c)(a+b+c) = a²+ab+ac+ab+b²+bc+ac+bc+c²
= a²+2ab+2ac+2bc+b²+c²
c. (a+b-c)(a+b-c) = a²+ab-ac+ab+b²-bc-ac-bc+c²
= a²+2ab-2ac-2bc+b²+c²
d. (a-b+c)(a-b+c) = a²-ab+ac-ab+b²-bc+ac-bc+c²
= a²-2ab+2ac-2bc+b²+c²
e. (a-b-c)(a-b-c) = a²-ab-ac-ab+b²+bc-ac+bc+c²
= a²-2ab-2ac+2bc+b²+c²