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Mathematics 7 Online
OpenStudy (anonymous):

(3a + 11)(3a - 11).

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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