Question

Please help me solve this.
Please give the answer process by process.
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Answer 1

Step-by-step explanation:

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Answer 2

Answer:

(a) = 15x² + 2y² + 3xy + 12

Step-by-step explanation:

(a) 14x² - 2xy + y² + 5xy - 2y² + 5 + x² + 3y² + 7

= 14x² + x² + y² - 2y² + 3y² - 2xy + 5xy + 5 + 7

= 15x² + 2y² + 3xy + 12