Question

(x+2)^3-(x-1)^3=9x+36

Answer 1

(x+2)^3-(x-1)^3=9x+36
(x+2)³-9x-1)³-9x-36=0
(x³+6x²+12x+8)=(x³-3x²+3x-1)-9x-36=0
x³+6x²+12x+8x³+3x²-3x+1-9x-36=0
9x²-27=0
9x²=27
x²=27÷9
x²=3
ответ:x=-√3;x=√3