(1)Δ=9+32=41>0
x=(-3±√41)/4
(2)2x²-3x-8=0
Δ=9+64=73>0
x=(3±√73)/4
(3)(2x-3+1)(2x-3-3)=0
(2x-2)(2x-6)=0
(x-1)(x-3)=0
x=1或x=3
(4)x²+8x-16=0
Δ=64+64=64×2>0
x=(-8±8√2)/2=-4±4√2
(1)Δ=9+32=41>0
x=(-3±√41)/4
(2)2x²-3x-8=0
Δ=9+64=73>0
x=(3±√73)/4
(3)(2x-3+1)(2x-3-3)=0
(2x-2)(2x-6)=0
(x-1)(x-3)=0
x=1或x=3
(4)x²+8x-16=0
Δ=64+64=64×2>0
x=(-8±8√2)/2=-4±4√2