Помогите решить уравнение! y^2+1,4y+0,49-25y^2=0

-24y²+1,4y-0,49=0

24y²-1,4y-0,49=0 1,4=7/5 0,49=49/100

D = (7/5) ²+4*24*49/100) = 49/25+24*49/25=25*49/25=49 √D=7

y1 = (7/5+7) / (24*2) = (7+35) / (5*48) = 42 / (5*48) = 7 / (5*8) = 7/40

y2 = (7/5-7) / 48 = (7-35) / (5*48) = - 28 / (5*48) = - 7 / (5*12) = - 7/60

ответ y1=7/40; y2 = - 7/60