Question

if (x+5) is a factor of p ( x) =x^3-20x + 5 k ; then k
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Answer 1

Answer:

put x + 5 = 0

x = - 5

$now \: p( - 5) = 0 \\ {( - 5)}^{3} - 20( - 5) + 5k = 0 \\ - 125 + 100 + 5k = 0 \\ 5k = 25 \\ k = 5$