+) \(x^2=121\)
\(\Rightarrow\orbr{\begin{cases}x^2=11^2\\x^2=\left(-11\right)^2\end{cases}}\Rightarrow\orbr{\begin{cases}x=11\\x=-11\end{cases}}\)
Vậy x = 11 hoặc x = -11
+) \(2^{x+3}=1024\)
\(\Rightarrow2^{x+3}=2^{10}\)
\(\Rightarrow x+3=10\)
\(\Rightarrow x=10-3\)
\(\Rightarrow x=7\)
Vậy x = 7
+) \(5^{x+1}=625\)
\(\Rightarrow5^{x+1}=5^4\)
\(\Rightarrow x+1=4\)
\(\Rightarrow x=4-1\)
\(\Rightarrow x=3\)
Vậy x = 3
_Chúc bạn học tốt_
x^2 = 121
=> x = 11
2^(x+3)=1024
=> x+3=10
x=10-3
x=7
5^ ( x+1) = 625
=> x+1 = 4
x=3
\(x^2=121\)
\(x^2=11^2\)
\(\Rightarrow x=11\)
Vậy \(x=11\)
\(2^{x+3}=1024\)
\(2^{x+3}=2^{10}\)
\(x+3=10\)
\(x=10-3\)
\(x=7\)
Vậy \(x=7\)
\(5^{x+1}=625\)
\(5^{x+1}=5^4\)
\(x+1=4\)
\(x=4-1\)
\(x=3\)
Vậy \(x=3\)
