Answer:x3-3x2+12
Una muna yung sa dulo bale +12-7=+5, next -3x2+4x2=x2 nalang since +4-3=1 carry down yung x2, last yung pinakauna which is x3+3x3=4x3 since may imaginary 1 sa unahan nung x3 pero di na yon sinusulat dahil matik na yon carry down yung x3 since pareha lang yung variable at exponent
