(4k^2+2k+3)(k^2+k+6)

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You might want to look at this video:http://www.brightstorm.com/d/math/s/algebra/u/polynomials-2/t/multiplying-larger-degree-polynomials-using-distributingSpecifically watch problem 3, it'll help you with multiplying, as opposed to adding and subtracting polynomials.