4/х²-9 - x+1/x-3=1
4/(х-3)(х+3) - x+1/x-3=1
4-(х+1)² / (х-3)(х+3)=1
(2-(х+1))(2+х+1) / (х-3)(х+3)=1
(2-х-1)(х+3) / (х-3)(х+3)=1
1-х / х-3=1
1-х = х-3
1+3=х+х
2х=4
х=2
-2с^3d^4*(8c^2-c^3d+4d^3)
<h2>-16с⁵d⁴+2c⁶d⁵-8c³d⁷</h2>
(2b - 1)² - (b + 2)² = 4b² - 4b + 1 - (b² + 4b + 4) = 4b² - 4b + 1 - b² - 4b - 4 = 3b² - 8b - 3
D = 64 + 36 = 100 = 10²
x₁ = 8 - 10 / 6 = -1/3
x₂ = 8 + 10 / 6 = 3
3(x + 1/3)(x - 3)