Question

for what value of k, if 3 is a zero of polynomual 2 X square + X + k
pls ans this question briefly

Answer 1

just put p(x)=3
put value of x that is 3 in equation and relate to zero
the answer will be k=-21

Answer 2

If the 3 is the zero of this polynomial so,
x=3
putting the value of x in the quadratic polynomial
2x²+x+k=0
2(3)²+3+k=0
2×9+3+k=0
18+3+k=0
21+k=0
k= -21
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