x²+3x/4-5/9=0x²+2*3x/8+(3/8)²-(3/8)²-5/9=0(x+3/8)²=9/64+5/9(x+3/8)²=81/576+320/576(x+3/8)²=401/576x+3/8=±√401/24x=-8/3±√401/24