if x^5+kx^2 is divided by(x-1) (x-2) (x-3) the remainder contains no term in x^2 then k=
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(x – 1) (x – 2) (x – 3) = x3 – 6x2 + 11x – 6
Let the quotient and remainder when
x5 + kx2 is divided by (x – 1) (x – 2) (x – 3) be
(ax2 + bx + c) and dx + e
Now
x5 + kx2 = (x3 – 6x2 + 11x – 6) (ax2 + bx + c) + dx + e
Comparing the coefficients of x5, x4, x3 and x2 we get
a = 1
b – 6 a = 0 ⇒ b = 6
c – 6 b + 11 a = 0 ⇒ c = 25
– 6 c + 11 b – 6 a = k
⇒k = –90
Hence, the value of k is –90
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