Example

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

Question

$$y^{4}+(2b^{2}-a^{2})y^{2}+b^{4}a$$

Evaluate

$y^{4}+2\left(by\right)^{2}+ab^{4}-\left(ay\right)^{2}$

Expand

$y^{4}+2\left(by\right)^{2}+ab^{4}-\left(ay\right)^{2}$

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