+0

# which is it?

0
74
1
+701

http://prntscr.com/lfphdu

Nov 8, 2018

#1
+3563
0

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