\(5.5^{2x+2}=125\)
\(=>5^{2x+2}=125:5\)
\(=>5^{2x+2}=25=5^2\)
\(=>2x+2=2\)
\(=>2x=2-2\)
\(=>2x=0\)
\(=>x=0:2\)
\(=>x=0\)
5 . 52x + 2 = 125
52x + 2 = 125 : 5
52x + 2 = 25
52x + 2 = 52 (cùng cơ số)
⇒ 2x + 2 = 2 hoặc 2x + 2 = -2
2x = 2 - 2 2x = -2 - 2
2x = 0 2x = -4
x = 0 x = -4 : 2
x = -2
Vậy x = 0 hoặc -2.