[tex]y=(2x+3)(4-3x) => y=-6x^2-x+12\\\Delta=(-1)^2-4*(-6)*12\\\Delta=1+288\\\Delta=289\\p=\frac{1}{-12}=-\frac1{12}\\q=\frac{-289}{-24}=\frac{289}{24}=12\frac1{24}\\W(-\frac1{12}, 12\frac1{24})[/tex]
[tex]y=(\frac12x-2)(6x+12) => y=3x^2-6x-24\\\Delta=(-6)^2-4*3*(-24)\\\Delta=36+288\\\Delta=324\\\\p=\frac{6}6=1\\q=\frac{-324}{12}=-27\\W(1, -27)[/tex]
