Question

if the sum of the zeros of the quadratic polynomial 3x²-kx+12 is 5 find k​

Answer 1

Step-by-step explanation:

In a general quadratic equation of form ax²+bx+c=0, sum of roots are by

$- \frac{b}{a}$

→ In the given quadratic equation, 3x² −kx+6=0

a=3,b=−k,c=6

sum of roots

$- \frac{b}{a} = - \frac{( - k)}{3} = \frac{k}{3}$

and sum of roots is given 3

=k/3=3

⇒

k=9

Answer 2

Step-by-step explanation:

$hi$

In the given quadratic equation, 3x² −kx+6=0

a=3,b=−k,c=6

sum of roots

$</p><p></p><p>- \frac{b}{a} = - \frac{( - k)}{3} = \frac{k}{3}− </p><p>a</p><p>b$

=−

3

(−k)

=

3

k

and sum of roots is given 3

=k/3=3

⇒

k=9