Verified answer

............10k^2..+ 10k......+ 1

5k - 4) 50k^3 + 10 k^2 - 35 k - 7

............50k^3 - 40 k^2

........................50 k^2 - 35 k

.........................50k^2 -.. 40k

.......................................5k..- 7

.......................................5k ..-4

...............................................-3

there should be a 5k in front of the -7 and the -4, in the last two lines

Yahoo answers is mucking about with the typing..