write all coefficient term of divident as
)5 0 6 8 (
note:0 is to be written as coefficient of missing term
in divisor we take -2
note:we put constant term of divisor with opposite sign
-2 )5 0 6 8 (
bring down first coefficient and multiply & keep it down to next place like
-2 )5 0 6 8 (
-10 20 -52
5 -10 26 -43
then we keep the constants skipping the 1st variable given in question
i.e. 5x^2-10x+26
and remainder is -43