Question

[Hà Ngọc Điệp]

Bài 1:Tìm x

a) \(x^3+9x^2+27x+19=0\)

b) \(x\left(x+5\right)\left(x-5\right)-\left(x+2\right)\left(x^2-2x+4\right)=3\)

c) \(\left(5-2x\right)^2-16=x\)

d) \(\left(x-3\right)^3-\left(x-3\right)\left(x^2+3x+9\right)+9\left(x+1\right)^2=15\)

Bài 2:Tìm x,y,z

\(x^2+2x+y^2-6y+4z^2-4z+11=0\)