(4x+3)(5-x)-x2=8x+19

Question

(4x+3)(5-x)-x2=8x+19

Answer 1

20х+15-4х^2-3х-х^2-8х-19=0 9х-5х^2-4=0 Д=9^2-4*(-5)*(-4)=81-80=1, Д>0, 2 корня х1= (-9+√1)/2*(-5)=8/10=4/5 х2= (-9-√1)/2*(-5)=10/10=1