a²+b²+c²+2ab-2bc এর সাথে কত যোগ করলে যোগফল পূর্ণবর্গ হবে?
Solution
Correct Answer: Option D
a²+b²+c²+2ab-2bc
=> (-a)2 + (-b)2 + c2 + 2 (-a) (-b) + 2(-b).c + 2(-a).c + 2ac
=> (-a)2 + (-b)2 + (c)2 + 2ab - 2bc - 2ac + 2ac = 0
=> (-a -b -c)2 + 2ac = 0
অর্থাৎ -2ac করলে যোগফল পূর্ণবর্গ হবে ।
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