What is the purpose of the great wall of china?
a. to protect from roman merchants
b. to protect from northern barbarians
c. to make trade along the silk road easier
d. to be a residence for the china emperor

I took the quiz and got 100% with the answer B

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