Answer:
Step-by-step explanation:
Okay so what we have to do is expand using the FOIL technique, or First Outer Inner Last.
So:
Our first terms are a and a so multiplied together we get [tex]a^{2}[/tex]
Then we have outer which would be -b times a or -ab
Then we have inner which would be b times a or ab
And then we have our last term which would be b times b or [tex]-b^{2}[/tex]
Now we add all of our terms together to get:
[tex]a^{2} -ab + ab - b^{2} \\[/tex]
Which simplifies to
[tex]a^{2} - b^{2}[/tex]
