Question

4)if 2x+y=-5,prove that 8x^2+y^3-30xy+125=0​

Answer 1

Step-by-step explanation:

2x + Y + 5 = 0.

if a + b + c = 0, a³+b³+c³-3abc=0

notice the above expression is of the form (2x)³+5³+y³-(3×2x×5×y)

hence it is equal to zero