b²-4ac=(4√3)²-4√2×(-2√2)=64
x=(-4√3±8)／﹙2√2)
x1=-√6+2√2,x2=-√6-2√2 b²-4ac=(4√3)²-4√2×(-2√2)=64
x=(-4√3±8)／﹙2√2)
x1=-√6+2√2,x2=-√6-2√2