From the sum of x² - y³-1 and 1- x²-y² subtract - (1 + y²)
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Answer:
- y³
Step-by-step explanation:
[(x² - y³ - 1) + (1 - x² - y²)] - [-(1 + y²)]
=> [x² - y³ - 1 + 1 - x² - y²] - [-1-y²]
=> [x² - x² - 1 + 1 - y³ - y²] + 1 y²
=> 0 - 0 - y³ - y² + y²
=> - y³ + 0
=> -y³
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