Δ=b²﹣4ac=(-200)²-4×19×100=32400 x=[-b±√﹙b²-4ac﹚]÷2a x₁=﹙200+180﹚÷2×100=1.9 x₂=﹙200-180)÷2×100=0.1,3,(10x-1)(10x-19)=0 x1=1/10 x2=19/10,1,
