$A \cap B = \left[-\frac{3}{2}; 1\right]$

$A \cap B = (-\infty; 1) \cup (7; +\infty)$

$A \cap B = \left(-\frac{3}{2}; 2\right)$

$f(x) = \frac{1}{2}x^2 - x + \frac{3}{2}$

$f(x) = -\frac{1}{2}x^2 + x + \frac{3}{2}$

$f(x) = -\frac{1}{2}x^2 - x - \frac{3}{2}$

$C^+ = (-\infty; -2) \cup (1; +\infty)$

$C^+ = (-2; 1)$

$C^+ = \left[-2; \frac{1}{2}\right] \cup \left[\frac{1}{2}; 1\right]$

$(g \circ f)(x) = \frac{15x^2 - 10x + 4}{-9x^2 + 6x - 1}$

$(g \circ f)(x) = \frac{15x^2 + 10x - 4}{-9x^2 - 6x + 1}$

$(g \circ f)(x) = \frac{-15x^2 - 10x + 4}{9x^2 + 6x - 1}$