[tex]b )\\\\y=(\frac12x-2)(6x+12)\\y=3x^2+6x-12x-24\\y=3x^2-6x-24\\\Delta=(-6)^2-4*3*(-24)\\\Delta=36+288\\\Delta=324\\p=\frac{-b}{2a}=\frac{-(-6)}{2*3}=\frac66=1\\q=\frac{-\Delta}{4a}=\frac{-324}{4*3}=\frac{-324}{12}=-27[/tex]
[tex]W=(1; -27)[/tex]
[tex]c) \\\\y=(2x+3)(4-3x)\\y=8x-6x^2+12-9x\\y=-6x^2-x+12\\\Delta=(-1)^2-4*(-6)*12\\\Delta=1+288\\\Delta=289\\p=\frac{-b}{2a}=\frac{-(-1)}{2*(-6)}=\frac1{-12}=-\frac1{12}\\q=\frac{-\Delta}{4a}=\frac{-289}{4*(-6)}=\frac{-289}{-24}=\frac{289}{24}\\W=(-\frac1{12}; \frac{289}{24})[/tex]
