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Question Number 138575 by KwesiDerek last updated on 15/Apr/21

find x  x^2 −2^x =1  Any help

$$\boldsymbol{\mathrm{find}}\:\boldsymbol{\mathrm{x}} \\ $$$$\boldsymbol{\mathrm{x}}^{\mathrm{2}} −\mathrm{2}^{\boldsymbol{\mathrm{x}}} =\mathrm{1} \\ $$$$\boldsymbol{\mathrm{Any}}\:\boldsymbol{\mathrm{help}} \\ $$

Commented by soudo last updated on 15/Apr/21

  soit  g(x)= x^2 −1  and  h(x)=2^x   x^2 −1=2^(x )   g(x)=h(x)    etudier les variation de g et h puis construire  leur courbes      x=−1,2

$$ \\ $$$$\mathrm{soit}\:\:\mathrm{g}\left(\mathrm{x}\right)=\:\mathrm{x}^{\mathrm{2}} −\mathrm{1}\:\:\mathrm{and}\:\:\mathrm{h}\left(\mathrm{x}\right)=\mathrm{2}^{\mathrm{x}} \\ $$$$\mathrm{x}^{\mathrm{2}} −\mathrm{1}=\mathrm{2}^{\mathrm{x}\:} \\ $$$$\mathrm{g}\left(\mathrm{x}\right)=\mathrm{h}\left(\mathrm{x}\right) \\ $$$$ \\ $$$$\mathrm{etudier}\:\mathrm{les}\:\mathrm{variation}\:\mathrm{de}\:\mathrm{g}\:\mathrm{et}\:\mathrm{h}\:\mathrm{puis}\:\mathrm{construire} \\ $$$$\mathrm{leur}\:\mathrm{courbes}\:\: \\ $$$$ \\ $$$$\mathrm{x}=−\mathrm{1},\mathrm{2} \\ $$

Commented by KwesiDerek last updated on 15/Apr/21

how did you do it sir^� ,can you expand it further please

$$\mathrm{how}\:\mathrm{did}\:\mathrm{you}\:\mathrm{do}\:\mathrm{it}\:\mathrm{si}\bar {\mathrm{r}},\mathrm{can}\:\mathrm{you}\:\mathrm{expand}\:\mathrm{it}\:\mathrm{further}\:\mathrm{please} \\ $$

Commented by mr W last updated on 15/Apr/21

there is no “nice” exact method.  you can “see” that x=3 is a solution.  other solutions can only be obtained  approximately:  x≈−1.1983  x≈3.4075  x=3

$${there}\:{is}\:{no}\:``{nice}''\:{exact}\:{method}. \\ $$$${you}\:{can}\:``{see}''\:{that}\:{x}=\mathrm{3}\:{is}\:{a}\:{solution}. \\ $$$${other}\:{solutions}\:{can}\:{only}\:{be}\:{obtained} \\ $$$${approximately}: \\ $$$${x}\approx−\mathrm{1}.\mathrm{1983} \\ $$$${x}\approx\mathrm{3}.\mathrm{4075} \\ $$$${x}=\mathrm{3} \\ $$

Commented by KwesiDerek last updated on 15/Apr/21

can I have the step by step solution pls

$$\mathrm{can}\:\mathrm{I}\:\mathrm{have}\:\mathrm{the}\:\mathrm{step}\:\mathrm{by}\:\mathrm{step}\:\mathrm{solution}\:\mathrm{pls} \\ $$

Commented by mr W last updated on 15/Apr/21

no. you can not calculate the solution.

$${no}.\:{you}\:{can}\:{not}\:{calculate}\:{the}\:{solution}. \\ $$

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