2 Решите пожалуйста 5 уравнений !!! (1) -8x² = 0 (2) 16х² - 9 = 0 (3) 5у² +2 = 0 (4)...

$-8x^2=0\\ x^2=0\\ x=0\\ \\ 16x^2-9=0\\ 16x^2=9\\ x^2=\frac{16}{9}\\ x=\pm\frac{4}{3}\\ \\ 5y^2+2=0\\ 5y^2=-2\\ y^2=-\frac{2}{5}$
Корней нет
$-2x^2+5x=0\\ x(-2x+5)=0\\ \left \{ {{x=0} \atop {-2x+5=0}} \right. \\ \left \{ {{x=0} \atop {2x=5}} \right. \\ \left \{ {{x=0} \atop {x=2,5}} \right. \\ x_1=0; \ \ \ x_2=2,5\\ \\ 4x^2-9x=0\\ x(4x-9)=0\\ \left \{ {{x=0} \atop {4x-9=0}} \right. \\ \left \{ {{x=0} \atop {4x=9}} \right. \\ \left \{ {{x=0} \atop {x=2,25}} \right. \\ x_1=0; \ \ \ x_2=2,25$