Example

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

Question

$$25y^{2}+400y-36+20z-z^{2}$$

Evaluate

$25y^{2}+400y-z^{2}+20z-36$

Differentiate w.r.t. y

$50\left(y+8\right)$

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