2.
[tex]a)\\dla \ \ x = -8\\\\x^{2}-x = (-8)^{2}-(-8) = 64+8 = 72[/tex]
[tex]b)\\dla \ \ a = -4\\\\a^{2}-3a+1 = (-4)^{2}-3\cdot(-4)+1=16+12+1 = 19[/tex]
[tex]c)\\dla \ \ x = -7\\\\1+x(x-4) = 1 -7(-7-4) = 1-7\cdot(-11) = 1+77 = 78[/tex]
[tex]d)\\dla \ \ x = -4, \ y = -\frac{1}{4}\\\\x^{2}-4y = (-4)^{2}-4\cdot(-\frac{1}{4}) = 16+1 = 17[/tex]
[tex]e)\\dla \ \ x = -2, \ y = 5\\\\2x^{2}-y = 2\cdot(-2)^{2}-5 = 2\cdot4 - 5 = 8-5 = -3[/tex]
