a historian mostly works to
a) find out why a contemporary event occurred.
b)find out the truth about events from the past.
c)explain present-day events based on the past.
d)explain the mistakes of investigators long ago.

answer is x. lo xd

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