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Mathematics

Solve the following equation for x:

(43)2x+12=132(\sqrt[3]{4})^{2x + \dfrac{1}{2}} = \dfrac{1}{32}

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Answer

Given,

(43)2x+12=132[(22)13]2x+12=125(22)2x3+16=25(2)4x3+13=254x+13=54x+1=154x=16x=4.\Rightarrow (\sqrt[3]{4})^{2x + \dfrac{1}{2}} = \dfrac{1}{32} \\[1em] \Rightarrow [(2^2)^{\dfrac{1}{3}}]^{2x + \dfrac{1}{2}} = \dfrac{1}{2^5} \\[1em] \Rightarrow (2^2)^{\dfrac{2x}{3} + \dfrac{1}{6}} = 2^{-5} \\[1em] \Rightarrow (2)^{\dfrac{4x}{3} + \dfrac{1}{3}} = 2^{-5} \\[1em] \Rightarrow \dfrac{4x + 1}{3} = -5 \\[1em] \Rightarrow 4x + 1 = -15 \\[1em] \Rightarrow 4x = -16 \\[1em] \Rightarrow x = -4.

Hence, x = -4.

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