Question

2r²5r+8=0 ayuda es para mañana ​

Answer 1

2r²5r + 8 = 0

2×5 r² r + 8 = 0

10r² × r + 8 = 0

10r³ + 8 = 0

10r³ = 0 - 8

10r³ = -8

${r}^{3} = - \frac{4}{5} \\ r = \sqrt[3]{ - \frac{4}{5} } \\ r = - \frac{ \sqrt[3]{100} }{5}$