X + 6x - 4 = 10
7x - 4 = 10
7x = 14
x = 14/7
x = 2
Х² + 7х + 6 = 0
х1 + x2= -7
х1 × х2 = 6
х1 = -1
х2 = -6
х² + х = 56
х² + х - 56 = 0
х1 + х2 = -1
х1 × х2 = -56
х1 = -8
х2 = 7
3х² + 5х - 2 = 0
D = 25 - 4 × 3 × (-2) = √49 = 7
x1 = -5 + 7 / 2 × 3 = 2 / 6 = 1 / 3
x2 = -5 - 7 / 2 × 3 = -12 / 6 = -2
<span>3х</span>²-2х-16=0
<span>D=4+192=196=14</span>²
<span>х1 = 2+14/6=16/6=8/3
х2 = 2-14/6=-12/6=-2
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Решение прикреплено...............