Question

determinati numarul natural x din:

2 la puterea x₋₄=4

[(5·2·7)²+x]-401=5·10²

Answer 1

^=la puterea
2^(x-4)=4
2^(x-4)=2²
x-4=2
x=6


 [(5·2·7)²+x]-401=5·10²
 [70²+x]-401=500
  4900+x=500+401
  4900+x=901
x=4900-901
x=3999