Example

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

Question

$$\frac{4-b^{2}}{b^{2}-4y+4}$$

Evaluate

$\frac{4-b^{2}}{4+b^{2}-4y}$

Expand

$\frac{4-b^{2}}{4+b^{2}-4y}$

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