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OpenStudy (anonymous):
(3a + 11)(3a - 11).
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OpenStudy (anonymous):
Multiply.
OpenStudy (anonymous):
\[9a^2-11^2=9a^2-121\]
OpenStudy (anonymous):
Distribute. 3a*3a - 3a*11 + 11*3a - 11*11.
OpenStudy (anonymous):
9a^2-121
OpenStudy (anonymous):
\[(a-b)(a+b)=a^2-b^2\]
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