Question

64x^3 + 144x^2 + 108x + 27 = 0

Answer 1

$64x^3 + 144x^2 + 108x + 27 = 0 \ \ (4x+3)^3=0 \ \ 4x+3=0 \ \ 4x=-3 \ \ x=- frac{3}{4}$

Answer 2

64х^3+144х^2+108х+27=0
64х^3+48х^2+96х^2+72х+36х+27=0
16х^2*(4х+3)+24х*(4х+3)+9*(4х+3)=0
(4х+3)*(16х^2+24х+9)=0
(4х+3)*(4х+3)^2=0
(4х+3)^3=0
4х+3=0
4х=-3
х=-3/4=-0,75