5)(x²-4)²+(x²-4)=0
(x²-4)(x²-4+1)=0
(x-2)(x+2)(x-√3)(x+√3)=0
x={2;-2;√3;-√3}
6)(x²-6)²=x²
/x²-6/=/x/
1)x²-6=x
x²-x-6=0
x1+x2=1 U x1*x2=-6
x1=3 U x2=-2
2)x²-6=-x
x²+x-6=0
x3+x4=-1 U x4=-6
x3=-3 U x4=2
7)(4x-1)²-4(4x-1)+4=0
4x-1=a
a²-4a+4=0
(a-2)²=0
a=2⇒4x-1=2⇒4x=3⇒x=0,75
8)
x³(x+1)-(x+1)=0
(x+1)(x³-1)=0
x+1=0⇒x=-1
x³-1=0⇒x³=1⇒x=1