What is the product of the polynomials below?
(x + 2)(2x^2 + 9x + 8)
a. 2x^3 + 13x^2 - 26x + 16
b. 2x^3 + 17x^2 + 22x + 16
c. 2x^3 + 13x^2 + 26x + 16
d. 16x^3 + 72x^2 + 46x - 16

You multiply the terms i n the second bracket by   x  then multiply them by + 2 then simplify
= 2x^3 + 9x^2 + 8x + 4x^2 + 18x + 16  
now add like terms

= 2x^3 
- now add the  like terms :-   9x^2 + 4x^2 = 13x^2  and so on