Question

Решите квадратное уравнение ​

Answer 1

$4(4x^{2} -32x+64)-30x+120+9=0\\16x^{2} -128x+256-30x+120+9=0\\16x^{2} -158x+385=0\\x1=\frac{158+18}{32} \\x2=\frac{158-18}{32} \\x1=\frac{35}{8} , x2=\frac{11}{2} \\x1=4,375 , x2=5,5$