Question

the polinomial of x2+2x-a then a=​

Answer 1

Step-by-step explanation:

Let p(x)=x²+2x−a

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

x² +2x−a=0

Put x=3, we get

(3)²+2(3)−a=0

⇒9+6−a=0

⇒15−a=0

⇒−a=−15