Question

find value of k if x-2 is zero of polynomial 3x2-kx +5​

Answer 1

Answer:

$x - 2 \: is \: a \: zero \: of \: the \: polynomial$

$x - 2 = 0$

$x = 2$

Putting the value of x in the polynomial

${3x}^{2} - kx + 5 = 0$

$3 {(2)}^{2} - 2k + 5 = 0$

$12 + 5 - 2k = 0$

$17 - 2k = 0$

$- 2k = - 17$

$2k = 17$

k = 17/2

Ans. 17/2

Hope it helps.

Answer 2

$x - 2 = 0 \: x = 2$

$= 3 {x}^{2} - kx + 5$

$= 3 {(2)}^{2} - k(2) + 5$

$= 12 - 2k + 5$

$= 17 - 2k$

$17 - 2k = 0$

$17 = 2k$

$k = \frac{2}{17}$