(2x - 3)2 = 81
=> (2x - 3)2 = 92 = (-9)2
=> \(2x-3\in\left\{9;-9\right\}\)
=> \(2x\in\left\{12;-6\right\}\)
=> \(x\in\left\{6;-3\right\}\)
Vậy \(x\in\left\{6;-3\right\}\)
(2x - 3)2 = 81
=> (2x - 3)2 = 92 = (-9)2
=> \(2x-3\in\left\{9;-9\right\}\)
=> \(2x\in\left\{12;-6\right\}\)
=> \(x\in\left\{6;-3\right\}\)