What was the ceremony called in which the vassals promised their loyalty to a lord.

A commendation ceremony

Explanation: A commendation ceremony is a formal ceremony that evolved during the Early Medieval period to create a bond between a lord and his fighting man, called his vassal.

A commendation ceremony (commendatio) is a formal ceremony that evolved during the Early Medieval period to create a bond between a lord and his fighting man, called his vassal.

Explanation:

answer

explanation

the given equation is

we can rewrite this as:

let

then the equation becomes:

the factors of 8 that sum up to -9 are {-1,-8}

we split the middle term with these factors to obtain,

we factor by grouping to obtain:

apply the zero product property to get:

but

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