Question

решите уравнение х^5-81х=0

Answer 1

$x( {x}^{4} - {3}^{4} ) = 0 \ x( {x}^{2} - {3}^{2} )( {x}^{2} + {3}^{2} ) = 0 \ x(x - 3)(x + 3)( {x}^{2} + 9) = 0 \ x1 = 0 \ x2 = 3 \ x3 = - 3 \ {x}^{2} = - 9 : net : resheniy$
3 корня.