9. The innermost part of the earth is comprised of (A) gold
(C) diamonds
(B) water
(D) rocks

D) rocks

Explanation:

the earth is made up of mostly rocks and melted iron

D) rocks and B) water.

That was a biology,but i hope it's okay.

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