Question

If 3 is a zero of the polynomial
x² + 2x-a
Find 'a​

Answer 1

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

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Answer 2

Answer:

3²+2(3)-a=0

9+6-a=0

15-a=0

a=15

Explanation:

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