х=1
1×2-1+6=7
7>0
(1-5)(1+5)=-4×6=-24
-24<0
1)X^2 - x - 6 = 0
D = 1 + 4*6 = 25
x1 = ( 1 + 5)/2 = 6/2 = 3;
x2 = ( 1 - 5)/2 = - 4/2 = - 2;
2) 2/5 x=0
0,01x=25
0×x=0
X-1/20
X-5/x²-25=0
5+x²=0
(x+3)(x-7)
