Find the Missing Monomial, Factor or Term $$( x + 10 ) \cdot ? = x ^ { 2 } - 100$$

Multiple Choice

Find the missing monomial, factor or term.
- $$( x + 10 ) \cdot ? = x ^ { 2 } - 100$$

A) $x ^ { 2 } - 10$
B) $x + 10$
C) $x ^ { 2 } + 20$
D) $x - 10$