X^2 - 9x + 8 = 0
D = 81 - 32 = 49
x1 = (9 + 7)/2 = 8
x2 = (9 - 7)/2 = 1
x^2 - 9x + 8 = (x - 8)(x - 1)
14у+12у-2у² = 26у-2у² = 2у(13-у)
a1 б3 в2..............................................................
1) y=12x^2-x-1
y'=12*2*x-1=24x-1
y'=0
24x-1=0
24x=1
x=1/24
2) y=(x-1)(x-1)
y'=1*(x-1)+(x-1)*1=x-1+x-1=2x-2
y'=0
2x-2=0
x=1.
Y=sin(3х-9)'=cos 3
cтарая я стала, вроде так...