Let's perform the synthetic division
color(white)(aaaa)aaaa-10−10|∣color(white)(aaaa)aaaa-1−1color(white)(aaaa)aaaa00color(white)(aaaaaa)aaaaaa7575color(white)(aaaa)aaaa-250−250
color(white)(aaaaaaaa)aaaaaaaa#|color(white)(aaaa)##color(white)(aaaaaa)10#color(white)(aaa)aaa-100−100color(white)(aaaaa)aaaaa250250
color(white)(aaaaaaaaa)aaaaaaaaa_________________________________________________________##
color(white)(aaaaaaaa)aaaaaaaa#|color(white)(aaaa)#-1−1color(white)(aaaa)aaaa1010color(white)(aaaa)aaaa-25−25color(white)(aaaaaa)aaaaaacolor(red)(0)0
The remainder is 00 and the quotient is =-x^2+10x-25=−x2+10x−25