If [tex]\((n-2)\)[/tex] is a factor of the polynomial equation [tex]\(2n^3 + 3n^2 - kn + 4 = 0\)[/tex], then [tex]\(k =\)[/tex] ?

A. 6
B. 8
C. 7
D. 9



Answer :

To determine the value of [tex]\( k \)[/tex], given that [tex]\( (n-2) \)[/tex] is a factor of the polynomial equation [tex]\( 2n^3 + 3n^2 - kx + 4 = 0 \)[/tex], we can use the fact that if [tex]\( (n-2) \)[/tex] is a factor, then the polynomial must equal zero when [tex]\( n = 2 \)[/tex].

Let's substitute [tex]\( n = 2 \)[/tex] into the polynomial equation:

[tex]\[ 2(2)^3 + 3(2)^2 - k(2) + 4 = 0 \][/tex]

Now, calculate each term step-by-step:

[tex]\[ 2(2)^3 = 2 \cdot 8 = 16 \][/tex]
[tex]\[ 3(2)^2 = 3 \cdot 4 = 12 \][/tex]
[tex]\[ -k(2) = -2k \][/tex]
[tex]\[ 4 = 4 \][/tex]

Now we substitute these values back into the polynomial equation:

[tex]\[ 16 + 12 - 2k + 4 = 0 \][/tex]

Combine the constants:

[tex]\[ 16 + 12 + 4 = 32 \][/tex]

So the equation simplifies to:

[tex]\[ 32 - 2k = 0 \][/tex]

To solve for [tex]\( k \)[/tex], move [tex]\( 2k \)[/tex] to the left side:

[tex]\[ 32 = 2k \][/tex]

Divide both sides by 2:

[tex]\[ k = \frac{32}{2} = 16 \][/tex]

So the value of [tex]\( k \)[/tex] should be [tex]\( 16 \)[/tex], but none of the given options correspond to [tex]\( 16 \)[/tex]. Because the polynomial equation provided contained a term involving [tex]\( x \)[/tex], if it was a misread or misinterpretation, we could double check what polynomial was supposed to be calculated.

Hence, we check the options provided and re-confirm the scenario. If still there's a discrepancy within the task context itself then further context might be provided or clarified.

But following numeric calculation of provided options:
Considering the factorization expectation and solving appropriately the approach steps matches conceptual solution unless the term sign/expressions adds different [tex]\(x\)[/tex] specific including term incorrect interpreting specific as [tex]\(n\)[/tex].

For validation on closer stepwise ensures calculation for correctness approach and exact polynomial might adjusted known inconsistency in problem.