Найдите сумму и произведение корней уравнения:

X^2-6x+8=0

X^2-5x+6=0

X^2+2x-3=0

X^2-7x+2=0

X^2-6x+5=0

X^2-x-30=0

X^2 - 6x + 8 = 0

D = 36-4*8=4

x1 = 8 / 2 = 4

x2 = 4/2 = 2

X1+x2 = 6

x1*x2 = 8

X^2-5x+6=0

D = 25 - 4*6=1

x1 = 6/2 = 3

x2 = 4/2 = 2

x1+x2=5

x1*x2=6

X^2+2x-3=0

D=4 - 4 * (-3) = 16

x1 = - 2+4/2 = 1

x2 = - 2-4/2 = - 3

x1+x2 = - 2

x1*x2=-3

X^2-7x+2=0

по теореме Виета

x1+x2 = - b/a = 7

x1*x2 = с/a = 2

X^2-6x+5=0

D = 16

x1=1

x2=5

x1+x2=6

x1*x2=5

X^2-x-30=0

D=121

x1=-5

x2=6

x1+x2=1

x1*x2=-30