Question

if 3 is the zero of the polynomial x2 +2x-a then a=?.​

Answer 1

Answer:

• 15.

Step-by-step explanation:

Given,

• 3 is the zero of polynomial x² + 2x - a.

To find,

• a

We know,

Remainder theorem: If p(x) is divided by (x - a), the remainder is p(a).

⇒ x² + 2x - a

⇒ (3)² + 2(3) - a

⇒ 9 + 6 = a

⇒ 15 - a = p(3)

Now, p(3) = 0, hence:

⇒ 15 - a = 0

⇒ a = 15

∴ Value of a is 15.

Answer 2

answer is

a = 15

step by step answer

If 3 is the zero of p(x) , then p(3) = 0. Take p(3) and find the value of a from that equation.

=>P(a)=a²+2a-a

=>P(3)=3²+2(3)-a

=>P(3)=>15-a

=>15-a=0

=>A=15

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