1) ответ х1-х2=-8-1=-9
2)х²-8х+16=х²-12х+36
4х=20
х=5
3)х=2
4)(х(х²-4)+3(х²-4))/(x²-4)=0
(x+3)(x²-4)/(x²-4)=0
x+3=0
x=-3
5)x²=a
a²-5a+4=0 a1=4 a2=1
x²=4 (x²=-1)-∅
x=2 x=-2
1. (a^2+b)(a+b^2)= a^3+a^2b^2+ab+b^3
<span>2. (a^2+2b)(2a+b^2)= 2a^3+a^2b^2+4ab+2b^3</span>
A²b²-a+ab²-1=(a²b²+ab²)-(a+1)=ab²(a+1)-(a+1)=(a+1)(ab²-1).
1)(x+11-x)(x+11+x)=11
11(2x+11)=11
2x= -10
x= -5
2)44+z^2-144-24z-z^2=0
-100-24z=0
z= -25/6
3)69-169+26y-y^2+y^2=0
-100+26y=0
y=50/13
4)31-t^2=-t^2+18t-81
31-t^2+t^2-18t+81=0
112=18t
t=56/9