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
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
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
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