1.

Find the value of k, when x – 5 is a factor of x3 – 3x2 + kx – 10.

Answer»

Let p(x) = x3 – 3x2 + kx – 10

When x – 5 is a factor of p(x) then P( 5) = 0

⇒ (5)3 – 3(5)2 + k x 5 – 10 = 0

⇒ 125 – 75 + 5k – 10 = 0

⇒ 5k – 40 = 0

k = \(\frac { 40 }{ 5 }\) = 8

Hence, k = 8



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