X^2 - 3x - 10 = 0;
Корни будут 5 и -2
y=logx y^2+2y-8=0 D1=1+8=9=3^2 y1=-1+3=2 y2=-1-3=-4 logx=2 logx=-4
1. 4+8y +8 = 2y - 10 - 7y +9
12 + 8y = -5y - 1
8y + 5y = -1 -12
13y = -13
y = -13 / 13
y = -1
2. 3x/5 = 6+x/3
9x = 30 + 5x
9x - 5x = 30
4x = 30
x = 30/4
x = 7,5
3. 8x - (7x + 8) = 9
8x - 7x - 8 = 9
8x - 7x = 9 + 8
x = 17
Решение задания смотри на фотографии .