Предмет: Математика, автор: shiko1337

log3(2 + 7) = − 2 решите уровнение​


bbvggcc7: щас попробую
shiko1337: благодарю
settom: а как можно решить уравнение без неизвестной?))
bbvggcc7: а.
bbvggcc7: бывает
settom: log3(2+7) равно 2, но никак не минус 2

Ответы

Автор ответа: dobra888
0

Ответ:    x  =  - 3 4/9  .

Пошаговое объяснение:

log₃(2х+ 7) = − 2 ;

{ 2х + 7 = 3⁻² ;

{ 2х + 7 > 0 ;

{ 2х + 7 = 1/9 ;

{ 2x > - 7 ;

{ 2x = - 6 8/9 ;

{ x > - 7 : 2 ;

{ x  =  - 3 4/9 ;

{ x > - 3,5   -  правильна нерівність , бо  - 3 4 /9 > - 3,5 .

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