Question

Решите уравнение:

(x+2)³ - (x - 1)³= 9x² + 36

(x+3)³= x²(x+9)

Answer 1

х³+6х²+12х+8 - х³+3х²-3х+1 = 9х²+36
9х²+9х-9х² = 36-9
9х = 27
х = 3

х³+9х²+27х+27 = х³+9х²
х³+9х²+27х-х³-9х² = -27
27х = -27
х = -1