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Să se calculeze: a) \( \lim _{x \rightarrow 1}\left(x^{2}+3 x\right) \)

Ask by Mccarthy Davies. in Romania
Nov 21,2024

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\[ \lim _{x \rightarrow 1}\left(x^{2}+3 x\right) = 4 \]

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Pentru a calcula limita \( \lim _{x \rightarrow 1}(x^{2}+3 x) \), putem substitui direct valoarea lui \( x \) cu 1 în expresie. Astfel, avem: \[ 1^{2} + 3 \cdot 1 = 1 + 3 = 4 \] Deci, limita este 4. Pentru a verifica intuitiv, putem analiza cum se comportă funcția \( f(x) = x^{2} + 3x \) în apropierea lui 1. Funcția este continuă, iar valoarea ei în punctul 1 este evidentă și constantă, deci limita va coincide cu valoarea funcției în acest punct.

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