\(7^{2x}+7^{2x+2}=2450\)
\(\Rightarrow7^{2x}+7^{2x}\times7^2=2450\)
\(\Rightarrow7^{2x}\times\left(1+7^2\right)=2450\)
\(\Rightarrow7^{2x}\times50=2450\)
\(\Rightarrow7^{2x}=49\)
\(\Rightarrow7^{2x}=7^2\)
\(\Rightarrow2x=2\)
\(\Rightarrow x=2:2\)
\(\Rightarrow x=1\)
Vậy x = 1
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