Question

5^x-3 + 5² = 650.  Tìm x 

Answer 1

5^x-3 + 5² = 650

5^x-3 = 650 - 5²

5^x-3 = 625

5^x-3 = 5⁴

<=> x - 3 = 4

x = 4 + 3

x = 7