The multiplication of two terms result in only two terms after multiplication, if middle terms cancels each other.
Consider an example of (x + 3)(x - 3).
Evaluate the product of (x + 3)(x - 3).
[tex]\begin{gathered} (x+3)(x-3)=x^2+3x-3x-3\cdot3 \\ =x^2-9 \end{gathered}[/tex]So possible example of two terms which results in only terms in multiplication is (x + 3)(x - 3).