3. Решите уравнение: a) x²-32 = 0 б) 16-49y2 = 0 в) (3-у)²-у(у+2,5)=9

3. Решите уравнение:

1. a) \[x^2 - 3^2 = 0\] \[x^2 = 9\] \[x = \pm \sqrt{9}\] \[x = \pm 3\]
2. б) \[16 - 49y^2 = 0\] \[4^2 - (7y)^2 = 0\] \[(4 - 7y)(4 + 7y) = 0\] \[4 - 7y = 0 \quad \text{или} \quad 4 + 7y = 0\] \[7y = 4 \quad \text{или} \quad 7y = -4\] \[y = \frac{4}{7} \quad \text{или} \quad y = -\frac{4}{7}\]
3. в) \[(3 - y)^2 - y(y + 2.5) = 9\] \[9 - 6y + y^2 - y^2 - 2.5y = 9\] \[-6y - 2.5y = 0\] \[-8.5y = 0\] \[y = 0\]