Question

${x}^{2} - 9 = 0$
${x}^{2} - 4x = 0$

Решить неполные квадратные уравнения​

Answer 1

1) $x^{2} -9=0\\x^{2} =9\\x=+-3\\x_{1} =-3, x_{2} =3$

2) $x^{2} -4x=0\\x(x-4)=0\\x=0\\x-4=0\\x=0\\x=4\\x_{1} =0, x_{2} =4$