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http://prntscr.com/lfphdu

 Nov 8, 2018
 #1
avatar+5076 
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You don't need to multiply all this out

 

Just look at the denominator.  It's not allowed to be zero.

 

\(d = (5k^2 - 25k) \cdot 7k^4 = \\ 35k^5(k-5)\\ \text{so }k\neq 0,~5\)

 

so (a) and (d)

 Nov 8, 2018

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