Question

Determinati x apartine lui R astfel incat:

a) 6 supra x =x supra 6

b)5x supra 4 = 15 supra x

c) (x+5) totul la puterea 2 = 25

Va rog ajutati-ma.. Multumesc. :)

Answer 1

6/x=x/6
x^2=36
x=rad 36
x=6

5x/4=15/x
5x^2=60
x^2=12
x=rad 12
x=2rad3

(x+5)^2=25
x+5=rad 25
x+5=5
x=5-5
x=0