ответ:x1=1260
x2=1440
Пошаговое объяснение:
4(100x^2-300x+225)-150x+225+9=0
400x^2-1200x+900-150x+225+9=0
400x^2-1350x+1134=0
a=400; b=-1350; c=1134
D=b^2-4ac=1350^2-4(400X1134)=8100
x1=-b/2a - √D/2a=1350 - 90=1260
x2=-b/2a + √D/2a=1350 + 90 =1440
