Предмет: Математика, автор: neznaika5630

Решить уравнение
log 3 (2 x + 5) = 2

Ответы

Автор ответа: gousp11

log 3 (2x-5)=2

Находим область определения функции:
2x-5>0
2x>5
x>2,5

Решаем уравнение:
2x-5=3^2
2x-5=9
2x=9+5
2x=14
x=7

7 входит в область определения функции

Ответ: 7

gousp11: Извиняюсь. Не то решил

gousp11: log 3 (2x+5)=2

Находим область определения функции:
2x+5>0
2x>-5
x>-2,5

Решаем уравнение:
2x+5=3^2
2x+5=9

2x=9-5
2x=4
x=2

2 входит в область определения функции

Ответ: 7

gousp11: Ответ:2 !!!!

neznaika5630: хорошо)

neznaika5630: спасибо

gousp11: Не за что)

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