Hope this will help u....:)
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Answer:
[tex](2k2 + 7k4 + 3) + (2k2 - 6 + 6k4) \\ 2k2 + 2k2 + 7k4 + 6k4 + 3 - 6 \\ = 4k2 + 13k4 - 3[/tex]
