Question

What should be added to -3 + 4xy + 2x² to get
3x² + 7xy + 2.​

Answer 1

Answer:

let z be the added number

2x²+4xy-3+(x)=3x²+7xy+2

z=(3x²+7xy+2)-(2x²+4xy-3)

z=x²+3xy+5

Therefore x²-3xy+5 should be added to get 3x²+3xy+5 .

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Answer 2

Answer:

For getting 3x² + 7xy + 2,

1st polynomial must be subtracted from 2nd,

So, 3x² + 7xy + 2 - ( -3 + 4xy + 2x² )

= 3x² + 7xy + 2 + 3 - 4xy - 2x²

= 3x² - 2x² + 7xy - 4xy + 2 + 3

= x² + 3xy + 5