Example

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

Question

$$x^{2}+(a-b)x-ab$$

Evaluate

$\left(x-b\right)\left(x+a\right)$

Expand

$x^{2}+ax-bx-ab$

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