Question

решите уравнения (-5×-3)(2×-1)=0

Answer 1

(-5x -3)(2x -1) =0

-10x^2 +5x -6x +3 =0

-10x^2 -x +3 =0, *(-1)

10x^2 +x -3 =0

D =b^2 -4ac,
(a =10, b =1, c = -3)

D =1 +4*10*3 =121 =11^2

x1,x2=(-b+-корень изD)/2a

x1 =(-1 -11)/20 = -0.6

x2 =(-1 +11)/20 =0.5

ответ: x= -0.6, x =0.5