4m - 2 + 3m -10 = 7m -12.
ОДЗ
x ≠ - 5; x ≠ 5
3x = - x(x + 5)
- x^2 - 5x - 3x = 0
- x^2 - 8x = 0
x^2 + 8x = 0
x (x + 8) = 0
x = 0
x + 8 = 0 ==> x = - 8
Ответ
- 8; 0
4x^2 - 17x + 15 ≥ 0
4x^2 - 17x + 15 = 0
D = 49 = 7^2
x1 = (17 + 7)/8 = 3;
x2 = (17 - 7 )/8 = 5/4 = 1,25
+ - +
----------- 5/4 ------------ 3 ----------> x
x ∈ ( - ∞; 1,25] ∪ [3; + ∞)
3*2^6-2^3*2^6+5*2^6=2^6(3-8+5) Можно упростить
(2^6)*0=0