Question

For what value of k, 3 is the zero of the polynomial p(x) = 2x²+x+k?​

Answer 1

Answer:

Now, we are having a polynomial 2x2+x+k we are asked to find k such that 3 is zero of the polynomial. Hence, we got that for k = – 21, x = 3 is a zero of the polynomial, 2x2+x+k.

Answer 2

Answer:

-21

Step-by-step explanation:

as 3 is zero of polynomial

then p(3)=0

$p(x)=2x^{2} +x+k$

$p(3)=2(3)^{2} +3+k=0\\18+3+k=0\\21+k=0\\k=-21$