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Question
(a + b – c)2 is equal to __________
Options
(a – b + c)2
(–a – b + c)2
(a + b + c)2
(a – b – c)2
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Solution
(–a – b + c)2
Explanation;
Hint:
(a + b – c)2 = a2 + b2 + c2 + 2ab – 2bc – 2ac
(–a – b + c)2 = a2 + b2 + c2 + 2ab – 2bc – 2ac
OR
(–a – b + c)2 = (–1)2 (a + b + c)2 ...(taking – 1 as common)
= (a + b – c)2
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