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यदि f(x) = x2 और g(x) = 5x – 6 जहाँ x ∈ {2, 3, 4} है तो दोनों फलनों की समानता की जाँच करो।

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यहाँ दोनों विधेय के प्रदेश समूच्य समान है । A = {2, 3, 4} f(x) = x2 

और g(x)=5x – 6 में x = 2, 3, 4 रखने पर x = 2 के लिए f(2) = (2)2 = 4 

और g(2) = 5 x 2 – 6 = 10 – 6 = 4

x = 3 के लिए f(3) = (3)2 = 9 और g(3) = 5 × 3 – 6 = 15 – 6 = 9

x = 4 के लिए f(4) = (4)2 = 16 और g(4) = 5 × 4 – 6 = 20 – 6 = 14

यहाँ f(4) g(4) है इसलिए f(x) और g(x) समान विधेय नहि है ।

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