alody1287 alody1287
  • 13-04-2017
  • Mathematics
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If (x + 2) is a factor of x3 − 6x2 + kx + 10, k =

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ghanami
ghanami ghanami
  • 13-04-2017
hello:
let : f(x) = x3 − 6x2 + kx + 10
If (x + 2) is a factor of x3 − 6x2 + kx + 10  : f(-2) = 0
(-2)^3-6(-2)² +k(-2)+10=0
-8 -24-2k +10 = 0
-2k =8+24-10
-2k = 22
k = -11
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