Question

simplify: (2x+y+4z)(4x²+y²+16z²-2xy-4yz-8zx)

Answer 1

8 x cube + y cube + 64 z cube-24xyz
we know that
a cube plus b cube plus c cube - 3abc = (a + b + c ) (asquare + b square + c square - ab- b c - ca)

Answer 2

first simplify the brackets

$(2x + 4z + y)(4x^{2} + 16z^{2} + y ^{2} - 2yx - 4zx - 8zx)$
this is your answer
i hope this will help you