Question $7-$ CRCs

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Assume that our generator polynomial G is the product P$*($X$+1),$ where P is a

primitive polynomial $($i$.$e$.$ it does not divide $11,101,1001,10001,$ etc$).$

a$)$ Assume P$,$ as a polynomial, ends in $"+1".$ What are the types of errors that

G can detect? $($x$-$bit detection, where x is $1,2,$ or $3?)$

b$)$ Assume P$,$ as a polynomial, does not end in $"+1".$ What are the types of

errors that G can detect? $($x$-$bit detection, where x is $1,2,$ or $3?)$