Class 11 Mathematics - Relations and Functions - Graphs of standard functions Easy Quiz

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यदि f(x)=x-2 और A={1,2,3} f का परिभाषा-क्षेत्र है, तो A पर f का ग्राफ कौन-सा है?

If f(x)=x-2 and A={1,2,3} is the domain of f, which of the following is the graph of f on A?

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Correct Answer

A. {(1,1),(2,4),(3,9)}

Explanation

Simple Explanation

किसी फलन का ग्राफ उसके सभी क्रमित युग्मों (x,f(x)) का समुच्चय होता है। यहाँ f(1)=12=1, f(2)=22=4 और f(3)=32=9 हैं, इसलिए ग्राफ {(1,1),(2,4),(3,9)} होगा। विकल्प C पहचान फलन y=x का ग्राफ है, जबकि विकल्प B में f(3)=9 के स्थान पर 6 दिया गया है। परीक्षा-युक्ति: प्रत्येक दिए गए x के लिए पहले f(x) निकालकर क्रमित युग्म बनाइए। / The graph of a function is the set of all ordered pairs (x,f(x)). Here, f(1)=12=1, f(2)=22=4, and f(3)=32=9, so the graph is {(1,1),(2,4),(3,9)}. Option C represents the identity function y=x, while option B gives 6 instead of the correct value 9 for x=3. Exam tip: calculate f(x) for every element of the domain before forming the ordered pairs.

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