Question

for what values of k is 3 a zero of the
polynomial f(x) = x2 + 11x k​

Answer 1

Explanation:

the answer will be

(3)²+11(3)+k=0

9+33+k=0

k=-42 OK friend

Answer 2

Explanation: By the factor theorem,

For 3 to be a zero of the polynomial f(x), f(3) should be equal to zero.

Put f(3)=0

-->(3)^2+11(3)+k=0

-->9+33+k=0

-->42+k=0

-->k= - 42

Answer= > k= - 42