Mathematics, 03.12.2020 14:20 julielebo8

What is (3x² + 5x - 9) + (7x² + 2x + 10)? I will give brainiest to the answer with step-by-step explanation :

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What is (3x² + 5x - 9) + (7x² + 2x + 10)? I will give brainiest to the answer with step-by-step exp...