Question

Найти сумму корней уравнения 8x^2+5x-13

Answer 1

D = 25 - 4*8*(-13) = 25 + 416 = 441   VD = 21

X1 = (- 5 + 21) 16 = 1

X2 = (-5 - 21) 16 = - 1.625

X1 + X2 = 1 - 1.625 = - 0.625

 

 

 

 

 

 

Answer 2

8x^2+5x-13=0

D=25+4*13*8=25+416=441

x1=(-5+21)/16=1

x2=(-5-21)/16)=-1,625

x1+x2=1+(-1,625)=-0,625

Ответ:-0,625