a)
[tex]y=-4x^2-x+3\\\\delta: 1-4*(-4)*3=1+48=49\\\sqrt{49}=7\\ \\x=\frac{1+7}{-8}=-1\\ x=\frac{1-7}{-8}=\frac{3}{4}\\ \\ y=-4(x+1)(x-\frac{3}{4})[/tex]
b)
[tex]y=2x^2-3x+4\\\\delta: 9-4*2*4=9-32 < 0\\x\neq R[/tex]
c)
[tex]y=9x^2+6x+1\\\\delta:36-4*9*1=0\\\sqrt{0}=0\\ \\x=\frac{-6}{18}=-\frac{1}{3}\\ \\ y=9(x+\frac{1}{3})^2[/tex]
