Question

Tìm x:
a) x(x-2)-x+2=0
b) (3-2x)²-(x-1)²=0
c) 81x⁴-x²=0
d) x³+x²+27x+27=0

Answer 1

a) (x-1)(x-2)=0

x-1=0 --> x = 1

x-2=0 --> x = 2

Answer 2

d) x^2(x + 1) + 27(x + 1)=0

(x+1)(x^2+27)=0

x+1=0 --> x = -1

x^2+27=0 (vô lí)