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a) { y= x do kwadratu - 4
{ x kwadrat -4 = 2x kwadrat - 10x +5
x kwadrat - 10x +9 =0
delta= 100-36=64
x= 10-8/2 = 1 y= -3
x2= 10=8/2 = 9 y2= 77
b) { y= x kwadrat - 2x + 4
{ x kwadtar - 2x +4 = x kwadrat - 9x +18
7x -14 = 0
7x = 14
x = 2 y = 4
c) { y = 2x kwadrat + 3
{ 2x kwadrat + 3 = 2x - 4
2x kwadrat - 2x + 7 = 0
delta = 4 - 56 < 0
x c do zbioru pustego