Question

Subtract the following: 2x²y²-5xy+y² from 2y²+6x²y²-xy



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Answer 1

Answer:

Answer is attached here

Answer 2

Answer:

y² + 4x²y² + 9xy

Step-by-step explanation:

2y² + 6x²y² - xy - (2x²y² - 5xy + y²)

= 2y² + 6x²y² - xy - 2x²y² + 10xy - y²

= 2y² - y² + 6x²y² - 2x²y² - xy + 10xy

= y² + 4x²y² + 9xy

Common Mistakes done by students:

1. Whenever it's given subtract a from b then do b - a. For example subtract 2 from 10 then we should do 10 - 2 = 8
2. Change of sign takes place while subtracting. For example (y + z) - (y - z) = y + z - y + z = 2z
3. Group the like terms together.

Thanks !

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