Question

what is a×b3+2c give the
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Answer 1

 Factoring:  axb3+2  

Theory : A sum of two perfect cubes,  a3 + b3 can be factored into  :

            (a+b) • (a2-ab+b2)

Proof  : (a+b) • (a2-ab+b2) =

   a3-a2b+ab2+ba2-b2a+b3 =

   a3+(a2b-ba2)+(ab2-b2a)+b3=

   a3+0+0+b3=

   a3+b3

Check :  2  is not a cube !!

Ruling : Binomial can not be factored as the difference of two perfect cubes

Final Result : axb3 + 2

Answer 2

Evaluate: ab3+2c

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