Question

[Nghiêm Thanh Hải]

5^2x-3-2.5² =5² . 3

Answer 1

[Dang Tung]

 

Answer 2

[Viên Tiến Duy]

5^2x-3-2.5² =5² . 3

⇔5^2x-1.5²-2.5²=5².3

⇔5².(5^2x-1-2)=5².3

⇔5^2x-1-2=3

⇔5^2x-1=5

⇔2x-1=1

⇔2x=2

⇔x=1

vay x=1