а) (x+3)² = x² + 23x + 3² = x² + 6x + 9б) (2-y)² = 2² - 22y + y² = 4 - 4y + y²
a) 2832 = (30-2)(30+2) = 30² - 2² = 900 - 4 = 896б) 6773 = (70-3)(70+3) = 70² - 3² = 4900 - 9 = 4891
Уравнение:3(x+1)(x-1) = 2(x-2)(x+2)3(x²-1) = 2(x²-4)3x² - 3 = 2x² - 8x² = 5x = ±√5
а) (x+3)² = x² + 23x + 3² = x² + 6x + 9
б) (2-y)² = 2² - 22y + y² = 4 - 4y + y²
a) 2832 = (30-2)(30+2) = 30² - 2² = 900 - 4 = 896
б) 6773 = (70-3)(70+3) = 70² - 3² = 4900 - 9 = 4891
Уравнение:
3(x+1)(x-1) = 2(x-2)(x+2)
3(x²-1) = 2(x²-4)
3x² - 3 = 2x² - 8
x² = 5
x = ±√5