1) 11х^2-6x-27=8x^2-6x
11x^2-6x-27-8x^2+6x=0
3x^2-27=0
3x^2=27
x^2=27/3
x^2=9
x=3
2) 26+5y-0,5y^2=2,5y^2+26
26+5y-0,5y^2-2,5y^2-26=0
5y-3y^2=0
y(5-3y)=0
y=0 5-3y=0
3y=5
y= 5/3
3)-7x^2+13x+9=-19+13x
-7x^2 +13x +9 +19 -13x=0
-7x^2 +28 =0
7x^2=28
x^2 = 4
x=2
4) 21z+11=11+17z-5z^2
21z+11-11-17z^2=0
21z-17z^2=0
z(21-17z)=0
z=0 17z=21
я= 21/17
5)(x-5)^2+ 4x = 25
x^2-10+25 +4x =25
x^2 +4x = 10
x (x+4)=10
x=10 x+4 =10
x=6
1) 11х^2-6x-27=8x^2-6x
11x^2-6x-27-8x^2+6x=0
3x^2-27=0
3x^2=27
x^2=27/3
x^2=9
x=3
2) 26+5y-0,5y^2=2,5y^2+26
26+5y-0,5y^2-2,5y^2-26=0
5y-3y^2=0
y(5-3y)=0
y=0 5-3y=0
3y=5
y= 5/3
3)-7x^2+13x+9=-19+13x
-7x^2 +13x +9 +19 -13x=0
-7x^2 +28 =0
7x^2=28
x^2 = 4
x=2
4) 21z+11=11+17z-5z^2
21z+11-11-17z^2=0
21z-17z^2=0
z(21-17z)=0
z=0 17z=21
я= 21/17
5)(x-5)^2+ 4x = 25
x^2-10+25 +4x =25
x^2 +4x = 10
x (x+4)=10
x=10 x+4 =10
x=6
(x+1)(x²-1)
a^2-b^2-a-b=(a²-b²)+(-a-b)=(a-b)(a+b)-1(a+b)=(a+b)(a-b)-1))
m^5-m^3+m^2-1=(m^5+m²)+(-m³-1)=
m²(m³+1)-1(m³+1)=(m³+1)(m²-1)
x-y-x^2+y^2=(x-y)+(-x²+y²)=(x-y)+(y²-x²)=
(x-y)+(y-x)(y+x)=(x-y)-(-y+x)(y+x)=(x-y)(-y-x)
x^4-x^3+x-1=(x⁴-x³)+(x-1)=x³(x-1)+1(x-1)=(x-1)(x³+1)