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Question

Add the following: a(a+b), b(b+c), c(a+c) and a2 + b2 + c2


A
+ ab + + bc + + ac
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B
+ ab + + bc + + ac
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C
+ 2ab + + bc + + ac
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D
+ 4ab + + 4bc + + 4ac
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Solution

The correct option is A + ab + + bc + + ac

a(a+b) = a2 + ab
b(b+c) = b2 + bc
c(a+c) = ac + c2
Now, a2 + ab
+ b2 + bc
+ c2 + ac
+ a2 +b2 +c2
= 2a2 + ab + 2b2 + bc + 2c2 + ac


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(x + a)(x +b)= x^2 + x(a+ b) + ab
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