Question

rozwiaz rownanie : x do pot. 3 - 7x do kw . +2x-14=0

Answer 1

x^3 - 7x^2 + 2x -14 = 0

x^2*(x-7)+ 2(x-7) = 0

(x-7)(x^2 + 2) = 0

x-7 = 0

x = 7

====

x^2 + 2 > 0

 

Odp. x = 7