a)7x^2+6x+1=0
D = b^2 - 4ac = 6^2 - 4*7*1 = 36 - 28 = 8
VD = V8 = V(4*2) = 2V2
- 6 + 2V2 - 6 + 2V2
x1 = =
2 * 7 14
- 6 - 2V2 - 6 - 2V2
x2 = =
b)3x^2-124x-84=0
D = b^2 - 4ac = (-124)^2 - 4*3*(-84) = 15376 + 1008 = 16384
VD = V16384 = 128
x1 = (124 + 128)/2*3 = 252/6 = 42
x2 = (124 - 128)/2*3 = -4/6 = -2/3
а) 7х^2+6х+1=0 б) 3х^2-124х-84=0
49х+6х=1+0 9х-124х=84+0
55х=-1 -115х=84
х= 1 х= 84
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55 115
a)7x^2+6x+1=0
D = b^2 - 4ac = 6^2 - 4*7*1 = 36 - 28 = 8
VD = V8 = V(4*2) = 2V2
- 6 + 2V2 - 6 + 2V2
x1 = =
2 * 7 14
- 6 - 2V2 - 6 - 2V2
x2 = =
2 * 7 14
b)3x^2-124x-84=0
D = b^2 - 4ac = (-124)^2 - 4*3*(-84) = 15376 + 1008 = 16384
VD = V16384 = 128
x1 = (124 + 128)/2*3 = 252/6 = 42
x2 = (124 - 128)/2*3 = -4/6 = -2/3
а) 7х^2+6х+1=0 б) 3х^2-124х-84=0
49х+6х=1+0 9х-124х=84+0
55х=-1 -115х=84
х= 1 х= 84
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55 115