+37091 2x(x+78)(x+38)8x Lets expand the two portions in the parentheses first
2x(8x) ( x^2 +38x +78x + 2964) and simplify a bit (2x * 8x = 16x^2)
16x^2 (x^2 + 116x + 2964) and use distributive property to finish (if you want to go farther)
16x^4 + 1856x^3 + 47424x^2
