x²(x+1)=9(x+1)
x²(x+1)-9(x+1)=0
(x+1)(x²-9)=0
(x+1)(x+3)(x-3)=0
x1= -1, x2= -3, x3= 3
x+x+x/2+x/4+1=100 4x+4x+2x+x+4=400 11x=396 x=36
(5,6*3,4)/11,9=19,04/11,9=1,6