Question

if (x-3)is a factor of the polynomial (2x^2+x+k)find it​

Answer 1

Answer:

-21

Step-by-step explanation:

given, (x-3) is a factor of  polynomial 2x²+x+k

=> 2(3)² + 3 + k = 0     (by factor theorem)

=> 2(9) + 3 + k = 0

=> 21+k = 0

=> k = -21

Answer 2

Answer:

zero of (x-3)=3 so P (3)=0

so,P (3)=2×3^2+3+k

0=2×9+3+k

18+3+k=0

21+k=0

so,k=-21