Question

решите уравнение 15х в квадрате -4х-35=0

Answer 1

15x^2 - 4x - 35 = 0

D = b^2 - 4*a*c = -4^2 - 4*15*(-35) = 16+2100 = 2116

VD = V2116 = 46

x1 = (4-46)/2*15 = -42/30 = -1 i 12/30 = -1 i 4/10 = -1 i 2/5

x2 = (4+46)/2*15 = 50/30 = 5/3 = 1 i 2/3

 

OTBET: x=-1 i 2/5  i  x=1 i 2/3