Question

(7x-12y)×(7x+12y)-49x² x=2 y=0.01

Answer 1

Формула: (а - б) * (а + б) = а² - б²

(7x - 12y) × (7x + 12y) - 49x² = (7х)² - (12у)² - 49х² = 49х² - 144у² - 49х² = -144у²

При x=2 y=0.01:

144у² = 144 * (0.01)² = 144 * 0,0001 = 0,0144