5/What should be added to 7x² + 3xy - y to get
- x² + 2xy + y?
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Answer:
- 8x² - xy +2 y
Step-by-step explanation:
given addend= 7x² + 3xy - y
sum = - x² + 2xy + y
required addend = sum - given addend
= - x² + 2xy + y -(7x² + 3xy - y)
= - x² + 2xy + y -7x² - 3xy +y
= - 8x² - xy +2 y
required addend == - 8x² - xy +2 y
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