Math help with polynomials?

Mathematics
Tutor: None Selected Time limit: 1 Day

a.. Explain why the FOIL order cannot be used to multiply a binomial by 

a trinomial. 
b. Explain why (3x + 2)2 does not equal 9x2 + 4. 
Jul 21st, 2015

Thank you for the opportunity to help you with your question!

a) it can only be used for binomial values

b)  (3x+2)^2=9x^2+12x+4 hence not equal=9x^2+4

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jul 21st, 2015

Thanks so much! i was just wondering how you got to the final answer in b?

Jul 21st, 2015

using identity ,square 3x then  add to 3x*2*2 then add 2^2 hence you get

9x^2+12x+4

Jul 21st, 2015

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