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The solution is x² - 81.
We need to simplify the following expression:
⇒ [tex]\sf (x+9)(x-9)[/tex]
The way we're going to simplify this is we are going to use FOIL.
FOIL is an acronym that stands for:
Now let's simplify.
First multiply all the terms
[tex]\sf x*x + x*(-9)+9*x+9*(-9)[/tex]
Now simplify
[tex]\sf x^2+9x-9x-81[/tex]
Combine the like terms in the middle
[tex]\sf x^2-81[/tex]