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Mathematics

Evaluate:

3x2 + 5xy - 4y2 + x2 - 8xy - 5y2

Algebraic Expressions

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Answer

3x2 + 5xy - 4y2 + x2 - 8xy - 5y2

Arrange the polynomial with like terms together and combine them.

= (3x2 + x2) + 5xy - 4y2 - 8xy - 5y2

= 4x2 + (5xy - 8xy) - 4y2 - 5y2

= 4x2 - 3xy + (- 4y2 - 5y2)

= 4x2 - 3xy - 9y2

Hence, 3x2 + 5xy - 4y2 + x2 - 8xy - 5y2 = 4x2 - 3xy - 9y2

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