(b) 5x² + 3x 8, 4x + 7-2x², 6 – 5x + 4x
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(b) 5x² + 3x + 8 + 4x + 7 - 2x² + 6 – 5x + 4x
(I think you forgot to put a + sign in front of 8 in the first equation)
= 5x² - 2x² + 3x + 4x + 4x - 5x + 8 + 6 + 7
= 3x² + 6x + 21
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