Question

решите квадратное уравнение 25-9x²=0

Answer 1

$25 - {9x}^{2} = 0 \\ - {9x}^{2} = - 25 \\ x = - \frac {5}{3} \\ x = \frac{5}{3}$

Answer 2

$25-9x^2=0 \\ 5^2-(3x)^2=0 \\ (5-3x)(5+3x)=0 \\ 5-3x=0 \\ 3x=5 \\ x_1= \frac{5}{3} \\ 5+3x=0 \\ 3x=-5 \\ x_2= -\frac{5}{3}$