Question

Obten los 0roductos notables​

Answer 1

Respuesta:

0.816

Si te piden r, se debe igualar a cero

Explicación paso a paso:

$9r^{4} - 12r^{2} + 4 = (3r^{2} - 2)(3r^{2} - 2) \\\\ (3r^{2} - 2)(3r^{2} - 2)= 0\\ 3r^{2} - 2 = 0 \\ r^{2} = 2/3 \\ r = \sqrt{\frac{2}{3} }= 0.816$