Question 1205171
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In this problem, the given restrictions  𝛼,  𝛽,  𝛾 ≠ 0  and   𝑟 ≠ 0    are not necessary and do not matter.


The solution,  given by the other tutor,  works nicely without these restrictions,  too.



<U>My conclusion</U>:  &nbsp;&nbsp;&nbsp;&nbsp;So, &nbsp;these restrictions can be omitted.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;They are not necessary.