Question

Preciso desse cálculo (x-5)²=4

Answer 1

$({x - 5})^{2} = 4 \\ {x}^{2} - {5}^{2} = 4 \\ {x}^{2} + 25 = 4 \\ {x}^{2} = 4 - 25 \\ {x}^{2} = 21 \\ x = \sqrt{21}$