Example

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

Question

$$(x2-1)(y2-1)-4xy$$

Evaluate

$\left(x_{2}-1\right)\left(y_{2}-1\right)-4xy$

Expand

$1-y_{2}-x_{2}+x_{2}y_{2}-4xy$

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