Question

Решить уравнение 3х во 2 степени - 8=3(х-7)(х+7)

Answer 1

$3x {}^{2} - 8 = 3(x - 7)(x + 7)$

$3x {}^{2} - 8 = 3(x {}^{2} - 49)$

$3x {}^{2} - 8 = 3x {}^{2} - 147$

$- 8 = - 147$

х∈∅

$x∈∅$