Example

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

Question

$$(x-y+z)(x+y)$$

Evaluate

$\left(x+y\right)\left(x-y+z\right)$

Expand

$x^{2}+xz-y^{2}+yz$

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