यदि (f(x)=x-2+2) और (f(a)=18), जहाँ (a>0), तो (a) क्या होगा?
If (f(x)=x-2+2) and (f(a)=18), where (a>0), what is (a)?
Explanation opens after your attempt
A. (4)
Concept
(f(a)=a-2+2).
Why this answer is correct
From \(a^2+2=18\), we get \(a^2=16\).
Exam Tip
Since (a>0), (a=4). चरण 1: (f(a)=a-2+2) है। चरण 2: \(a^2+2=18\) से \(a^2=16\)। चरण 3: (a>0) दिया है, इसलिए (a=4)।
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