The number to check as a root and the coefficients of the dividend are unchanged here.
-1 | 2 9 7
|
| -2 -7
|____________________________
2 7 0
Bring down the 2; multiply by the "divisor", and put this under the 9; add the column.... continue the process.
The meaning of the result is that the original polynomial DOES have a factor , and the quotient shown for the division is . Observe the remainder 0 in the synthetic division.