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can anyone math help?

Factor f(x)=x^4-x^3-7x^2+x+6 into linear factors given that 1 is a zero of f(x)

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Robert J. | Certified High School AP Calculus and Physics TeacherCertified High School AP Calculus and Ph...
4.6 4.6 (13 lesson ratings) (13)
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You can use synthetic division.
1 | 1 -1  -7 1 6
........1..0 -7 -6
---------------------
....1 0..-7 -6|0
By oberving, -1 is another root.
-1 | 1 0 -7 -6
.......-1 1..6
-----------------
.....1 -1 -6|0
x^2-x-6 = (x-3)(x+2)
f(x) = (x-1)(x+1)(x-3)(x+2) <==Answer