Question

 

1.Решите уравнение:  30х2 + 13х – 3 =0               

2.Решите уравнение  15х2 – 7х – 2 =0                                       

Answer 1

1.

X1,2= -3±√3^2 -4*30*(-3)/2*30=-3±√369/60=-3±19.2/60

X1=-3+19.2/60=0.27

X2=-3-19.2/60=0.37

2.

X1,2= 7±√(-7)^2-4*15*(-2)/2*15=7±√169/30=7±13/30

X1=7+13/30=20/30=2/3

X2=7-13/30=-6/30=-1/5