Question

решите уравнение (х+2)^3-х(3х+1)^2+(2х+1)(4х^2-2х+1)=42

Answer 1

(х+2)^3-х(3х+1)^2+(2х+1)(4х^2-2х+1)=42
x³+6x²+12x+8-x(9x²+6x+1)+(2x)³+1³=42
x³+8x³-9x³+6x²-6x²+12x-x+9=42
11x=33
x=3