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RECALL: $A^2-B^2=(A-B)(A+B)$ The given binomial can be written as: $=2^2t^2-3^2s^2 \\=(2t)^2-(3s)^2$ Factor the binomial using the formula above with $A=2t$ and $B=3s$ to obtain: $=(2t-3s)(2t+3s)$
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