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(x-8)^2=0
x-8=0
x=8
b)4x²+4x+1=0
(2x+1)^2=0
2x+1=0
2x=-1
x=-1/2
c)x(4+x)+x²=0
4x +x^2+x^2=0
x(4+2x)=0
x=0 lub 4+2x=0
x=0 lub 2x= -4
x=0 lub x= -2/4
x=0 liub x= - 1/2
d) (x+1)(x-1)=(2x+5)(x+1)
(x+1)(x-1)-(2x+5)(x+1)=0
(x+1)(x-1-2x-5)=0
(x+1)(-x-6)=0
x+1=0 lub -x-6 = 0
x= - 1 lub -x=6
x=-1 lub x= -6