Aku sebuah bilangan jika dipangkat2 lalu dibagi 4+akar pangkat 225=3

[tex] {x}^{2} \div 4 + \sqrt{225 } = 3 \\ {x}^{2} \div 4 + 15 = 3 \\ {x}^{2} \div 4 = 3 - 15 \\ {x}^{2} \div 4 = - 12 \\ {x}^{2} = - 12 \times 4 \\ {x}^{2} = - 48 \\ x = \sqrt{ - 48} = \sqrt{16} \sqrt{ - 3} = 4 \sqrt{ - 3} [/tex]