Question

If the sum of zeros of the quadratic polynomial 3x^2 – kx + 6 is 3 then find the
value of k.

Answer 1

Answer:

sum of the zeroes will be k/3 as by the formula noe k/3 is 3 which means k is 9..... hope it helps u mate

Answer 2

Given that,

Sum of zeroes of polynomial = 3.

Polynomial = 3x² - kx + 6

To find,

Value of k = ?

Solution,

We know that:

☞ Sum of zeroes of polynomial = -b/a .......(i)

By comparing the polynomial by equation ax² + bx + c = 0

• a = 3
• b = -k
• c = 6

From equation (i),

$\tt \implies 3 = \dfrac{ - b}{a} \\ \\ \tt \implies \: 3 = \dfrac{ - ( - k)}{3} \\ \\ \tt \implies k = 3×3$

$\large \implies \boxed {\boxed {\tt \blue {k = 9 }}}$

Hence, value of k is 9.