Question

for what value of k,3 will be one zero of the polynomial 2x^+x+k

Answer 1

Hey there,

The required polynomial is- 2x²+x+k
3 is the zero of the polynomial

2x²+x+k=0
∴2(3)²+(3)+k=0 (inbibing x=3)
∴2×9+3+k=0
∴18+3+k=0
∴21+k=0
∴k= -21

Hope this helps you!!