Question

b9 = 24, b6 = - 19

Визначте знаменник геометричної прогрессії (bn)

Answer 1

b7 = b6 * q
b8 = b7 * q = ( b6 * q ) * q = b6 * q^2
b9 = b8 * q = ( b6 * q^2 ) * q = b6 * q^3
/* b9 = b6 * q^3 */
24 = -1/9 * q^3
q^3 = -24*9 = - ( ( 2 * 2 * 2 * 3 ) * ( 3 * 3 ) )
q = -2 * 3 = -6