Question

1) If 2x + y = -5 ,prove that 8xpowercube + ycube - 30xy + 125 = 0
2) Expand ( 3x - 1/2y + 2z )
3) find the value p to the power of cube , if p - q = 10/9 and pq = 5/3
plz guyz answer fast its urgent

Answer 1

2x+y=-5,
2x+y+5=0,
  if a³+b³+c³=0,then a³+b³+c³=3abc,
So, 2x³+y³+5³=2x×3×y×5
   8x³+y³+125=30xy
   8x³+y³+125-30xy=0