Question

Помогите решить 3 примера

Answer 1

Ответ:

8. Замена:

$log3(x) = t \\ {t}^{2} - 2t - 8 = 0 \\ t1 = 4 \\ t2 = - 2 \\ log3(x) = 4 \\ x1 = 81 \\ log3(x) = - 2 \\ x2 = 1 \div 9$

9.

${t}^{2} - t - 2 = 0 \\ t1 = 2 \\ t2 = - 1 \\ log3(x) = 2 \\ x1 = 9 \\ log3(x) = - 1 \\ x2 = 1 \div 3$

10.

${t}^{2} + 3t - 4 = 0 \\ t1 = 1 \\ t2 = - 4 \\ l \\ log3(x) = 1 \\ x1 = 3 \\ log3(x) = - 4 \\ x2 = 1 \div 81$