Question

Determinati nr natural x stiind ca 7lax+7lax+2=2450

Answer 1

$7^{x} + 7^{x+2} = 2450 --\ \textgreater \ 50 * 7^{x} = 2450 --\ \textgreater \ 7^{x} = 49 \\  7^{x} = 7^{2} --> x = 2$