54x + 21 Evaluate dx where 9x2 + 7x + 8 > 0. | 9x² + 7x + 8 First substitute u = 54x + 21 -dx 7x + 8 Then du 9x2 + Now integrate with respect to u to get + C 54x + 21 -dx So 9x2 + 7x + 8 + C %3D

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