b: \(x^2-8xy+16y^2-121\)
\(=\left(x-4y\right)^2-121\)
\(=\left(x-4y-11\right)\left(x-4y+11\right)\)
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b: \(x^2-8xy+16y^2-121\)
\(=\left(x-4y\right)^2-121\)
\(=\left(x-4y-11\right)\left(x-4y+11\right)\)