Question

If x-2 is a factor of 3x4-2x3+7x2- 21x + k, then the value of k is


1. 2
2. 9
3. 18
4. -18

Answer 1

Answer:

-18 is correct answer

Step-by-step explanation:

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Answer 2

Answer:

-18

Step-by-step explanation:

by remainder theorem,

x-2=0

x=2

as the given equation is satisfied by x-2,

if we put x=2,

3*2^4 - 2 *2^3+ 7*2^2-21*2+k =0

48-16+28-42+k=0

18+k=0

k= -18