SubArea: Complex numbers in algebraic and polar formLevel: AProject ID: 9000035705Accepted: 1Clonable: 1Easy: 0Find the absolute value of the complex number \(z = (1 - 2\mathrm{i})(2 + \mathrm{i})\).\(5\)\(3\)\(\sqrt{10}\)\(2\sqrt{2}\)
