Log_4 (x^2+6x)=2 хэлп((

Question

Log_4 (x^2+6x)=2
хэлп((

Answer 1

4^2 = x^2 + 6x
x^2 + 6x - 16 = 0
D = 36 + 64 = 100
x1 = (-6 - 10)/2 = -8
x2 = (-6 + 10)/2 = 2
Проверка: log4(64-48) = log4(16)=2
log4(4+12) = log4(16) = 2
Ответ: -8 и 2

Comments

Спасибо большое)