Respuesta :

(6•2 - 3 - 5•3) - (4•3 + 2•2 - 8)
(12 - 3 - 15) - (12 + 4 - 8)
(9 - 15) - (16 - 8)
(-6) - (8)
-14
distribute invisibl -1 to he 4x³+2x²-8

we get
6x²-3-5x³-4x³-2x²+8
group like terms
-5x³-4x³+6x²-2x²-3+8
add them
-9x³+4x²+5