Fill in the Blank with One of the Words or Phrases

Multiple Choice

Fill in the blank with one of the words or phrases listed below. Not all choices will be used and some choices may be
used more than once. $$\begin{array} { l l l l } \text { factoring } & \text { quadratic equation } & \text { perfect square trinomial } & 0 \\\text { greatest common factor } & \text { hypotenuse } & \text { sum of two cubes } & 1 \\\text { difference of two cubes } & \text { difference of two squares } & \text { triangle } & \text { leg }\end{array}$$
-The expression $a ^ { 2 } - b ^ { 2 }$ is called a_______

A) difference of two squares
B) sum of two cubes
C) perfect square trinomial
D) difference of two cubes