What country isolated itself from outside influences from the 17th century through much of the 19th century?

From the 1600s to the mid 1800s, Japan isolated itself from outside influences, and limited both its trade and relations with other nations under what is called the sakoku policy, which is sometimes also called the “period of national isolation”.

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