<span>y=3x</span>
2X^2 + 7X - 8 = 0
D = 49 - 4*2*(-8) = 49 + 64 = 113 V 113 = 10.6
X1 = - 7 + 10.6 \ 4 = 0.9
X2 = - 7 - 10.6 \ 4 = - 4.4
ответ: 0.9 ; минус 4.4