Question

If 3 is a zero of the polynomial x2+2x-a find a

Answer 1

Answer:

15 = a. Now, The polynomial is x² + 2x - 15 . x = -5 , x = 3 . Therefore, the other zero is -5 .17

Step-by-step explanation:

Answer 2

Answer:

15

Step-by-step explanation:

Let p(x)=x

2

+2x−a

As the zero of this polynomial is 3, we know that p(3)=0.

x

2

+2x−a=0

Put x=3, we get

(3)

2

+2(3)−a=0

⇒9+6−a=0

⇒15−a=0

⇒−a=−15

⇒a=15