Verified answer

Step-by-step explanation:

A polynomial is zero polynomial when p(x)=0

(1) x−a=0

Add a both sides, we get

x−a+a=a ⇒x=a

So, answer is a.

(2) ax+b=0

Add −b both sides, we get

ax+b−b=−b⇒ax=−b

Divide both sides by a, we get

x=−

a

b

So, answer is −

a

b

.