Answer:
13x² + x - 23
Explanation:
(3x² + 7x - 4) + (10x² - 6x - 19)
=> 3x² + 7x - 4 + 10x² - 6x - 19
=> 3x² + 10x² +7x - 6x - 4 - 19
=> 13x² + x - 23
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