exam Maths Puzzle Numerical Ability

i have to use synthetic diision . (2x^4-5x^3-50x+1) divided by (x-4). I have no clue where or how to insert zeros.

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Give the reasons for the steps in the following proof. If 3x+(-1)=0, then x= 1/3
3x+(-1)=0
[3x+(-1)]+1= 0+1
3x+[(-1)+1]= 0+1
3x+0= 0+1
3x= 1
1/3(3x)= 1/3(1)
(1/3*3)x= 1/3*1
1*x= 1/3*1
x= 1/3 Use FOIL to find the product and match your result to the correct answer below:
(2x + 7)(x + 9)

A)x2 + 11x + 18
B)2x2 + 16x + 63
C)x2 + 25x + 63
D)2x2 + 25x + 63