<span>a^2-b/a - a
a^2-b/0
</span>a^2-b/0<span>
</span>
-3x^2-14x-7=x^2-2x+1
-3x^2-x^2-14x+2x-7-1=0
-4x^2-12x-8=0
D=(-12)^2-4×(-4)×(-8)=144-128=16
x1=12+4/2×(-4)=16/-8=-2
x2=12-4/2×(-4)=8/-8=-1
Ответ:
Объяснение:
x+y=20,
x*y = -91
x=20-y,
(20-y)y = -91, -y²+20y+91 = 0; y²-20y-91 = 0;
y1 = 10-√191; x1 = 20 - y1 = 20-10+√191 = 10+√191
y2 = 10+√191; x1 = 20 - y1 = 20-10-√191 = 10-√191
Ответ:(10+√191; 10-√191); (10-√191; 10+√191)