9x²-49=0
9x^2=49,
x^2=49/9
x1=7/3,x2=-7/3
x^3-3=3/8
x^3=27/8,
x=3/2
4(X+1)²-81=0.
(x+1)^2=81/4
x+1=9/2,x+1=-9/2
x1=9/7,x2=-11/2