Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$(8xy+9z)(8xy-9z)$$

Evaluate

$64\left(xy\right)^{2}-81z^{2}$

Expand

$64\left(xy\right)^{2}-81z^{2}$

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