Expert please do question no 2 and 5 :
Solution:
Ans 5. Let the required number is a.
x² - xy + 4y² - a = (-3x² - 4xy + 9y²)
a = x² - xy + 4y² - (-3x² - 4xy + 9y²)
a = x² - xy + 4y² + 3x² + 4xy - 9y²
a = 4x² + 3xy - 5y²
So, the required number is 4x² + 3xy - 5y²
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Ans 5. Let the required number is a.
x² - xy + 4y² - a = (-3x² - 4xy + 9y²)
a = x² - xy + 4y² - (-3x² - 4xy + 9y²)
a = x² - xy + 4y² + 3x² + 4xy - 9y²
a = 4x² + 3xy - 5y²
So, the required number is 4x² + 3xy - 5y²
P.S. For the remaining questions, kindly post them in a separate thread to get rapid assistance from our experts. Looking forward to hearing from you soon.