What should be added to x3+3x2y+3xy2+y3 to get x3+y3
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(x³ + y³) - ( x³ + 3x²y + 3xy² + y³)
= x³ + y³ - x³ - 3x²y - 3xy² - y³
= -3x²y - 3xy²
= -3xy( x + y )
Therefore this must be added.
= x³ + y³ - x³ - 3x²y - 3xy² - y³
= -3x²y - 3xy²
= -3xy( x + y )
Therefore this must be added.
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