a]
[tex]w(x)=x^2-8x-7\\\\w(3)=3^2-8\cdot3-7=9-24-7=-22\\\\w(-\frac{1}{2})=(-\frac{1}{2})^2-8\cdot\frac{1}{2}-7=0,25-4-7=-10,75[/tex]
b]
[tex]w(x)=x^4-4x^3+x^2+12x-1\\\\w(-\sqrt3)=(-\sqrt3)^4-4\cdot(-\sqrt3)^3+(-\sqrt3)^2+12\cdot(-\sqrt3)-1=\\\\=9-4\cdot(-3\sqrt3)+3-12\sqrt3-1=\\\\=9+12\sqrt3+3-12\sqrt3-1=11[/tex]
