Х²-2х-63=0
D=b²-4ac
D=4+252=256
√D=√256=16
x=2-16/2=-7
x=2+16/2=9
9x²+24x+16=0
D=576-576=0
x=-24/18=-4/3
х²+8х+17=0
D=64-68=-4<0 - нет решений<br>
-12х²+7х-1=0
12х²-7х+1=0
D=49-48=1
√D=√1=1
x=7-1/24=6/24=1/4
x=7+1/24=8/24=1/3
-3x²+px+p=0
b²-4ac=0
P²-4(-3)p=0
p²+12p=0
p(p+12)=0
p=0
p=-12
(3x²-7x+4)(5-4x)=0
3x²-7x+4=0
5-4x=0
5=4x
x=1,25
3х²-7х+4=0
D=49-48=1
√D=√1=1
x=7+1/6=8/6=4/3
x=7-1/6=1