Question

9xCuál es la raíz de esta ecuación cuadrada 9 x cuadrada - 1 = 0 ​

Answer 1

Respuesta:

$9 \times ( \frac{1}{3} ) {}^{2} - 1 = 9 \times \frac{1}{9} - 1 = \frac{9}{9} - 1 = 1 - 1 = 0$

$9 \times ( \frac{ - 1}{3} ) {}^{2} - 1 = 9 \times \frac{1}{9} - 1 = \frac{9}{9} - 1 = 1 - 1 = 0$

Explicación paso a paso:

${9x}^{2} - 1 = 0 \\ {9 {x}^{2} }^{} = 1 \\ \frac{ {9x}^{2} }{9} = \frac{1}{9} \\ {x }^{2} = \frac{1}{9} \\ \sqrt{x {}^{2} } = \sqrt{ \frac{1}{9} } \\ |x| = \frac{ \sqrt{1} }{ \sqrt{9} } \\ |x | = \frac{1}{3} \\ x = + - \frac{1}{3}$