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Question Number 124312 by liberty last updated on 02/Dec/20

    3^x  + 3^(−x)  = 3 −(x−3)^2    x =?

$$\:\:\:\:\mathrm{3}^{{x}} \:+\:\mathrm{3}^{−{x}} \:=\:\mathrm{3}\:−\left({x}−\mathrm{3}\right)^{\mathrm{2}} \\ $$$$\:{x}\:=?\: \\ $$

Answered by MJS_new last updated on 02/Dec/20

3^x +3^(−x)  is a “parabola” with minimum 2 at  x=0  3−(x−3)^2  is a parabola with maximum 3 at  x=3  these curves don′t intersect in R^2

$$\mathrm{3}^{{x}} +\mathrm{3}^{−{x}} \:\mathrm{is}\:\mathrm{a}\:``\mathrm{parabola}''\:\mathrm{with}\:\mathrm{minimum}\:\mathrm{2}\:\mathrm{at} \\ $$$${x}=\mathrm{0} \\ $$$$\mathrm{3}−\left({x}−\mathrm{3}\right)^{\mathrm{2}} \:\mathrm{is}\:\mathrm{a}\:\mathrm{parabola}\:\mathrm{with}\:\mathrm{maximum}\:\mathrm{3}\:\mathrm{at} \\ $$$${x}=\mathrm{3} \\ $$$$\mathrm{these}\:\mathrm{curves}\:\mathrm{don}'\mathrm{t}\:\mathrm{intersect}\:\mathrm{in}\:\mathbb{R}^{\mathrm{2}} \\ $$

Commented by Dwaipayan Shikari last updated on 02/Dec/20

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