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a+b=12, a-b = 2 হলে 2ab= ?

a+b=12, a-b = 2 হলে 2ab= ? Correct Answer 70

Related Questions

For realizing a binary half-subtractor having two inputs A and B, the current set of logical expression for the outputs D (A minus B) and X (borrow) are 1. The difference output D = A̅B + AB̅ 2. The borrow output B = AB̅ Which of the above statements is/are correct? 
a = 2 , b = 4 এবং c = 8 হলে-i. a : b = b : cii. a+bb+c2 = a2+2ab+b2b2+2bc+c2iii. a-bb-c2 = a2-2ab+b2b2-2bc+c2নিচের কোনটি সঠিক?
a+2ab=6 এবং ab=4 হলে 2/a+1/b=?
a=1. b=2, c=3 হলে a2+2ab-c
a2+b2-2ab=0 হলে a3b3+b3a3 এর মান কত? 
a+b = 6, a-b =2 হলে, 2ab =?
∆ABC  এ  a2+b2-c2=2ab হলে ∠c = কত ? 
a=√5, b=√3 হলে (a+b)2- 2ab এর মান কত? 
a= √2, b = √3 হলে (a+b)2-2ab এর মান কত?
(a-b)3 = 33  হলে, a2-2ab+b2 =  কত?