Question

Va rog ajutati-ma la ex 9

Answer 1

a) (7^x)^9 = 7^81

7^(9x) = 7^81

9x = 81

x = 9

b) (8^5)^40 = 2^(30x)

8^200 = 2^(30x)

(2^3)^200 = 2^(30x)

2^600 = 2^(30x)

600 = 30x

x = 600:30

x = 20

c) 10^13 = 50^13 : x^13

10^13 = (50:x)^13

10 = 50:x

x = 50:10

x = 5

d) (20:x)^30 = 4^30

20:x = 4

x = 20:4

x = 5