Question

5 is a zero of the quadratic polynomial, n2 -kn-15 find the value of k
​

Answer 1

n^2 - kn - 15

It is given in the question that 5 is zero of the polynomials so substitute 5 in the expression

5^2 - 5k - 15 = 0

25 - 5k - 15 = 0

-5k = -10

k = 2

Hope this helps :)