Question

2) (x + 40) x15 = 5 ^ 2 x 3^2x4 

Answer 1

(x + 40) . 15 = 5² . 3² . 4

(x + 40) . 15 = 25 . 9 . 4

(x + 40) . 15 = 900

x + 40 = 900 : 15

x + 40 = 60

x = 60 - 40

x = 20

Answer 2

( x + 40 ) x 15 = 5² x 3² x 4

⇒ ( x + 40 ) x 15 = 25 x 9 x 4

⇒ ( x + 40 ) x 15 = 900

⇒ x + 40 = 60

⇒ x = 20.

Vậy x = 20.