यदि (f(x)=x-2-1) और (g(x)=2x-2) हैं, तो ((f-g)(x)=0) के हल कौन से हैं?
If (f(x)=x-2-1) and (g(x)=2x-2), what are the solutions of ((f-g)(x)=0)?
Explanation opens after your attempt
Correct Answer
C. ({1,3})
Concept
((f-g)(x)=x-2-2x+1=(x-1)2), so the only solution is (x=1). A square is zero only when its inside term is (0).
Why this answer is correct
The correct answer is C. ({1,3}). ((f-g)(x)=x-2-2x+1=(x-1)2), so the only solution is (x=1). A square is zero only when its inside term is (0).
Exam Tip
((f-g)(x)=x-2-2x+1=(x-1)2), इसलिए केवल (x=1) हल है। पूर्ण वर्ग शून्य तभी होता है जब अंदर का पद (0) हो।
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