Question

Answer 1

\(3,5-2\left(x-\dfrac{2}{5}\right)^3=10\dfrac{1}{4}\\ \Rightarrow\dfrac{7}{2}-2\left(x-\dfrac{2}{5}\right)^3=\dfrac{41}{4}\\ \Rightarrow2\left(x-\dfrac{2}{5}\right)^3=\dfrac{-27}{4}\\ \Rightarrow\left(x-\dfrac{2}{5}\right)^3=\dfrac{-27}{8}\\ \Rightarrow\left(x-\dfrac{2}{5}\right)^3=\left(\dfrac{-3}{2}\right)^3\\ \Rightarrow x-\dfrac{2}{5}=\dfrac{-3}{2}\\ \Rightarrow x=-\dfrac{11}{10}\)

Answer 2

\(\Leftrightarrow2\left(x-\dfrac{2}{5}\right)^3=\dfrac{7}{2}-\dfrac{41}{4}=\dfrac{-27}{4}\)

=>x-2/5=-3/2

hay x=-3/2+2/5=-1,5+0,4=-1,1