Question

Решите уравнение 2х2-4х-1=(х-4)(4х-3)

Answer 1

3-4х=4х²-3х-16х+12

-4х²-4х+3х+16х+3-12=0

-4х²+15х-9=0

Д=225-4*(-4)*(-9)= 81

х1= -15+9/-8= -6/-8= 3/4

х2= -15-9/-8= -24/-8= 3