Question

What should be added to x³+ 3x²y+3xy² to get x³+y³​

Answer 1

Answer:

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Step-by-step explanation:

Question must be: What should be added to x³+ 3x²y+3xy²+y³ to get x³+y³​

The given expression is  

x³+3x²y + 3xy²+y³ + (unknown expression) = x³+y³

unknown expression = x³+y³ - (x³+3x²y + 3xy²+y³)

unknown expression = x³+y³ - x³-3x²y - 3xy² - y³

unknown expression = -3x²y - 3xy²

-3x²y - 3xy² should be added to x³+3x²y + 3xy²+y³ to get x³+y³