Question and Answers Forum

All Questions      Topic List

Limits Questions

Previous in All Question      Next in All Question      

Previous in Limits      Next in Limits      

Question Number 154390 by liberty last updated on 18/Sep/21

 lim_(x→2) ((x^2 e^x −4e^2 )/(x−2)) ?

$$\:\underset{{x}\rightarrow\mathrm{2}} {\mathrm{lim}}\frac{{x}^{\mathrm{2}} {e}^{{x}} −\mathrm{4}{e}^{\mathrm{2}} }{{x}−\mathrm{2}}\:? \\ $$

Commented by puissant last updated on 18/Sep/21

=lim_(x→2) (2xe^x +x^2 e^x )= 4e^2 +4e^2 =8e^2 ..

$$=\underset{{x}\rightarrow\mathrm{2}} {\mathrm{lim}}\left(\mathrm{2}{xe}^{{x}} +{x}^{\mathrm{2}} {e}^{{x}} \right)=\:\mathrm{4}{e}^{\mathrm{2}} +\mathrm{4}{e}^{\mathrm{2}} =\mathrm{8}{e}^{\mathrm{2}} .. \\ $$

Answered by yeti123 last updated on 18/Sep/21

lim_(x→2) ((x^2 e^x  −4e^2 )/(x − 2)) = lim_(x→2) ((2xe^x  + x^2 e^x )/1)                                 = lim_(x→2) e^x (2x + x^2 )                                 = 8e^2

$$\underset{{x}\rightarrow\mathrm{2}} {\mathrm{lim}}\frac{{x}^{\mathrm{2}} {e}^{{x}} \:−\mathrm{4}{e}^{\mathrm{2}} }{{x}\:−\:\mathrm{2}}\:=\:\underset{{x}\rightarrow\mathrm{2}} {\mathrm{lim}}\frac{\mathrm{2}{xe}^{{x}} \:+\:{x}^{\mathrm{2}} {e}^{{x}} }{\mathrm{1}} \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:=\:\underset{{x}\rightarrow\mathrm{2}} {\mathrm{lim}}{e}^{{x}} \left(\mathrm{2}{x}\:+\:{x}^{\mathrm{2}} \right) \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:=\:\mathrm{8}{e}^{\mathrm{2}} \\ $$

Terms of Service

Privacy Policy

Contact: info@tinkutara.com