Question

if 3 is a zero of the polynomial x^2+2x-a,then the value of a is​

Answer 1

Step-by-step explanation:

hope this will help you

Answer 2

Answer:

The value of a is 15

Step-by-step explanation:

Let $p(x)=x^{2} +2x- a$

Since 3 is a zero of the polynomial,

$p(3)=0$

⇒$3^{2} + (2)(3) - a = 0$

⇒$9+6-a=0$

⇒$15-a=0$

⇒$-a=-15$

∴$a=15$