Add 7x² - 4x + 5, -3x²+ 2x -l and 5x² -x+ 9 .
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Step-by-step explanation:
(7x² - 4x + 5) + (-3x²+ 2x -l) + (5x² -x+ 9 )
=7x² -3x² + 5x² - 4x + 2x - x + 5 -1 + 9
= 9x² - 3x +13
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