Question

if (x+5) is a factor of p(x) =x3 -20x+5k ,then k is
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Answer 1

Answer:

We know that (x+y) is a factor of p(x) when the p(a) is zero now see

zero of a (x+5)= -5

x³-20x+5k =0

5³-20 (5)+5 k =0

125 -100 +5k=0

25+5k =0

5k=. -25

k =25 /5

k =5

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