Question

Find the zero of polynomial X² + ax + 3

Answer 1

Answer:

Correct option is

A

9

It is given that 3 is a zero of the polynomial p(x)=3x

3

−x

2

−ax−45 which means that p(3)=0, so let us substitute x=3 in p(x) to find the value of a as shown below:

p(3)=3(3)

3

−(3)

2

−a(3)−45

⇒0=(3×27)−9−3a−45

⇒0=81−9−3a−45

⇒0=81−54−3a

⇒0=27−3a

⇒3a=27

⇒a=

3

27

⇒a=9

hence, a=9.