Let's perform the synthetic division
color(white)(aaaa)-2color(white)(aaaaa)|color(white)(aaaa)2color(white)(aaaaaa)7color(white)(aaaaaa)-1color(white)(aaaaa)1
color(white)(aaaaaaaaaaaa)_________
color(white)(aaaa)color(white)(aaaaaaa)|color(white)(aaaa)color(white)(aaaaaa)-4color(white)(aaaaaa)-6color(white)(aaaa)14
color(white)(aaaaaaaaaaaa)________
color(white)(aaaa)color(white)(aaaaaaa)|color(white)(aaaa)2color(white)(aaaaaaa)3color(white)(aaaaaa)-7color(white)(aaaa)color(red)(15)
(2x^3+7x^2-x+1)/(x+2)=(2x^2+3x-7)+15/(x+2)
The remainder is =15 and the quotient is =2x^2+3x-7