Zadanie 1
a) [tex](3x+y-4z)-(3x-y+7z)=3x+y-4z-3x+y-7z=2y-11z[/tex]
b) [tex](3a-4)(1-a)=3a-4-3a^{2} +4a=7a-4-3a^{2}[/tex]
c) [tex](x-6)^{2} =x^{2} -36[/tex]
d) [tex](a+3)(4-a)-(a-3)(4+a)=(4a+12-a^{2} -3a)-(4a+a^{2} -12-3a)=a+12-a^{2} -a-a^{2} +12+3a=3a+24-2a^{2}[/tex]
Zadanie 2
[tex]2x^{2} -3x[/tex] dla [tex]x=-2[/tex]
[tex]2*(-2)^{2} -3*-2=2*4+6=8+6=14[/tex]
