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2. (x + 5) × (5x - 1) = 5x² - x + 25x - 5
= 5x² + 24x - 5
3. (7 - 2x) × (2x - 7) = 14x - 49 - 4x² + 14x
= 4x² + 28x - 49
2. (x + 5) x ( 5x - 1) = 5x^2 - x + 25x - 5 = 5x^2 + 24x - 5
3. ( 7 - 2x) x ( 2x - 7) = 14x - 49 - 4x^2 + 14x = - 4x^2 + 28x - 49