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Question
Find the sum of: 5x2 – 2xy + 3y2 and – 2x2 + 5xy + 9y2 and 3x2 -xy- 4y2
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Solution
5x2 – 2xy + 3y2 and – 2x2 + 5xy + 9y2 and 3x2 -xy- 4y2
5x2 – 2xy + 3y2 + – 2x2 + 5xy + 9y2 + 3x2 -xy- 4y2
= 5x2 - 2x2 + 3x2 - 2xy + 5xy - xy + 3y2 + 9y2 - 4y2
= 8x2 - 2x2 + 5xy - 3xy + 12y2 - 4y2
=6x2 + 2xy + 8y2
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