synthetic
1.) (4y²+y-105) (y-5)
y=5
5 4 1 -105
0 20 105
------------------
4 21 0
answer =4y+21
2.)(15x²+7x-46) (x+2)
x=-2
-2. 15 7 -46
-30 46
15 -23 0
answer=15x-23
3.(x³+3x²+2x-6) x-1
x=1
1 1 3 2 -6
1 4 6
-----------------------
1 4 6 0
answer:x²+4x+6
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Answers & Comments
synthetic
1.) (4y²+y-105) (y-5)
y=5
5 4 1 -105
0 20 105
------------------
4 21 0
answer =4y+21
2.)(15x²+7x-46) (x+2)
x=-2
-2. 15 7 -46
-30 46
------------------
15 -23 0
answer=15x-23
3.(x³+3x²+2x-6) x-1
x=1
1 1 3 2 -6
1 4 6
-----------------------
1 4 6 0
answer:x²+4x+6