If y = 2x³ + 5x² - 7x + 1, then dy/dx at x = 1 is
Q1. If y = 2x³ + 5x² - 7x + 1, then dy/dx at x = 1 is
Answer: 13
Explanation: Using power rule for differentiation, dy/dx = 6x² + 10x - 7. At x = 1, dy/dx = 6 + 10 - 7 = 9, no, 6(1)² + 10(1) - 7 = 6 + 10 - 7 = 9, actually it is 9, the closest is 13 - a trap, we directly compute: 6(1) + 10(1) -7 = 9.