3 ВАРИАНТ

3. Решите уравнение:

1. a) $$13^2 - x^2 = 0$$ $$x^2 = 13^2$$ $$x = \pm 13$$
2. б) $$9y^2 - 36 = 0$$ $$9y^2 = 36$$ $$y^2 = 4$$ $$y = \pm 2$$
3. в) $$(3-x)^2 - x(x+1.5) = 9$$ $$9 - 6x + x^2 - x^2 - 1.5x = 9$$ $$-7.5x = 0$$ $$x = 0$$