Answer:
D. [tex]10x^7 + 7x^5 -2x + 9[/tex]
Step-by-step explanation:
Like terms: [tex]7x^7[/tex] and [tex]3x^7[/tex] = [tex]10x^7[/tex]
[tex]5x^5[/tex] and [tex]2x^5[/tex] = [tex]7x^5[/tex]
[tex]-3x[/tex] and [tex]x\\[/tex] = [tex]-2x[/tex]
[tex]7[/tex] and [tex]2[/tex] = [tex]9[/tex]
The answer would be: [tex]10x^7 + 7x^5 - 2x + 9[/tex]
Therefore, it is option D
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