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Need help with #2 please.

Need help with #2 please.-example-1
User Prokurors
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Answer: [D] -16x^4y + 4xy^4 + 16xy

Remove parentheses: (-a) = -a

-3xy^4 - 7x^4y + 7xy - 9x^4y + 9xy + 7xy^4

Group like terms

-7x^4y - 9x^4y - 3xy^4 + 7xy^4 + 7xy + 9xy

Add similar elements: -7x^4y - 9x^4y = -16x^4y

= -16x^4y - 3xy^4 - 7xy^4 - 16xy

Add similar elements: -3xy^4 + 7xy^4 = 4xy^4

= -16x^4y + 4xy^4 + 16xy

User Nolte
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