Question

What should be added to 2x³–y³+3y–3to get x³+y³+2y+1
​

Answer 1

Answer:

$2y {}^{3} - x {}^{3} - y + 4 \: \: \: should \: be \: added$

Step-by-step explanation:

$let \: the \: num \: added \: be \: (z) \\ 2x {}^{3} - y {}^{3} + 3y - 3 + z = x {}^{3} + y {}^{3} + 2y + 1 \\ x {}^{3} - 2y {}^{3} + y - 4 + z = 0 \\ z = 2y {}^{3} - x {}^{3} - y + 4$