1) =m²-n²
2) =q²-p²
3) =c²-d²
4)=y²-x²
5) =a²-c²
6) =y²-25
Log 1/4 (x^2 + 6x) = - 2
ОДЗ
x ∈ ( - ∞; - 6) ∪( 0; + ∞)
x^2 + 6x = (1/4)^(-2)
x^2 + 6x = (2^(-2))^(-2)
x^2 + 6x = (2^2)^2
x^2 + 6x = 4^2
x^2 + 6x = 16
x^2 + 6x - 16 = 0
D = 100
x1 = ( - 6 + 10)/2 = 2 ∈ ОДЗ
x2 = ( - 6 - 10)/2 = - 8 ∈ ОДЗ
Ответ
- 8; 2
Х+49=6х-30+2х-12
х-6х-2х= -49-30-12
х-6х-2х= -91
7х-2х= -91
5х= -91
х= -91/5
х= -18,2