gt⇒b2>(a+c)2" role="presentation" style="font-size: 13.696px; display: inline; word-spacing: 0px; position: relative;">b2>(a+c)2gt⇒b2>(a+c)2mà (a+c)2≥4ac⇒b2>4ac⇒b2−4ac>0" role="presentation" style="font-size: 13.696px; display: inline; position: relative;">(a+c)2≥4ac⇒b2>4ac⇒b2−4ac>0(a+c)2≥4ac⇒b2>4ac⇒b2−4ac>0do a>0" role="presentation" style="font-size: 13.696px; display: inline; position: relative;">a>0a>0 nên đây là pt bậc 2,mà Δ=b2−4ac>0" role="presentation" style="font-size: 13.696px; display: inline; position: relative;">Δ=b2−4ac>0Δ=b2−4ac>0nên có 2 no p/b
gt⇒b2>(a+c)2" role="presentation" style="font-size: 13.696px; display: inline; word-spacing: 0px; position: relative;">b2>(a+c)2gt⇒b2>(a+c)2mà (a+c)2≥4ac⇒b2>4ac⇒b2−4ac>0" role="presentation" style="font-size: 13.696px; display: inline; position: relative;">(a+c)2≥4ac⇒b2>4ac⇒b2−4ac>0(a+c)2≥4ac⇒b2>4ac⇒b2−4ac>0do a>0" role="presentation" style="font-size: 13.696px; display: inline; position: relative;">a>0a>0 nên đây là pt bậc 2,mà Δ=b2−4ac>0" role="presentation" style="font-size: 13.696px; display: inline; position: relative;">Δ=b2−4ac>0Δ=b2−4ac>0nên có 2 no p/b
gt⇒b2>(a+c)2" role="presentation" style="font-size: 13.696px; display: inline; word-spacing: 0px; position: relative;">b2>(a+c)2gt⇒b2>(a+c)2mà (a+c)2≥4ac⇒b2>4ac⇒b2−4ac>0" role="presentation" style="font-size: 13.696px; display: inline; position: relative;">(a+c)2≥4ac⇒b2>4ac⇒b2−4ac>0(a+c)2≥4ac⇒b2>4ac⇒b2−4ac>0do a>0" role="presentation" style="font-size: 13.696px; display: inline; position: relative;">a>0a>0 nên đây là pt bậc 2,mà Δ=b2−4ac>0" role="presentation" style="font-size: 13.696px; display: inline; position: relative;">Δ=b2−4ac>0Δ=b2−4ac>0nên có 2 no p/b