Complete the Trinomial Product with Mental Multiplication $$( x + 4 ) ( x - 9 ) = x ^ { 2 } - - { - } x - 36$$

Multiple Choice

Complete the trinomial product with mental multiplication. $$( x + 4 ) ( x - 9 ) = x ^ { 2 } - - { - } x - 36$$

A) 6
B) 3
C) 5
D) 8
E) 9