The answer of the multiplication of two polynomials after simplification is
.
According to the question,
We have the following two polynomials:
and 
Now, multiplying these two polynomials:

(Please note that the numbers with the same variables can be added and subtracted. For example, the numbers with the variable
can only be added or subtracted with variables having
.)
(More to know: every number has to be multiplied with every number in the bracket. For example, in this case, 7 from the first polynomial has been multiplied with the second polynomial. And 7 is multiplied with every number of this polynomial.)
Hence, the result after multiplying the two polynomials and simplifying them is
.
To know more about polynomials here
brainly.com/question/11536910
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