Example

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

Question

$$x^{2}-30\ x+21c$$

Evaluate

$x^{2}-30x+21c$

Differentiate w.r.t. x

$2\left(x-15\right)$

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