Question

помогите решить!!!
срочно!!!

Answer 1

${7}^{x + 2} - {7}^{x} = 336 \ {7}^{x} ( {7}^{2} - 1) = 336 \ {7}^{x} (49 - 1) = 336 \ {7}^{x} times 48 = 336 | div 48 \ {7}^{x} = 7 \ x = 1$
Ответ: x=1