1.

x = 1 पर फलन `f(x) = 2x + 3` के सांतत्य की जाँच कीजिए ।

Answer» यहाँ `f(x)=2x + 3, x = 1` पर,
(i) `f(1) = 2 xx 1 + 3 = 5`
(ii) R.H.I. `=underset(x rarr 1^(+))(lim)f(x)=underset(h rarr 0)(lim)f(1+h)`
`=underset(h rarr 0)(lim)2(1+h)+3`
`=underset(x rarr 0)(lim)(2+2h)+3`
`=underset(h rarr 0)(lim)5 + 2h`
`= 5 + 2 xx 0 = 5`
(iii) L.H.L. `=underset(x rarr 1^(-))(lim)f(x)=underset(h rarr 0)(lim)f(1-h)`
`=underset(h rarr 0)(lim)2(1-h)+3`
`=underset(h rarr 0)(lim)(2-2h)+3`
`=underset(h rarr 0)(lim) 5 - 2h`
`= 5 - 2 xx 0 = 5`
`therefore` R.H.L. = L.H.L. `= f(1) = 5`
अत: f(x) बिन्दु x = 1 पर संतत है ।


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