а)
Д = (-5)²-4*3*(-2) = 25+24 = 49
√Д = 7
Х1 = (5-7)/2*3 = -2/6 = -1/3
Х2 = (5+7)/6 = 2
б)
Д = 28² -4*49*4 = 784 - 784 = 0
Х = -28/(2*49 ) = -14/49 = -2/7
в)
0,2х * (х+0,2) = 0
х=0
и
х+0,2=0
х=-0,2
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Answers & Comments
а)
Д = (-5)²-4*3*(-2) = 25+24 = 49
√Д = 7
Х1 = (5-7)/2*3 = -2/6 = -1/3
Х2 = (5+7)/6 = 2
б)
Д = 28² -4*49*4 = 784 - 784 = 0
Х = -28/(2*49 ) = -14/49 = -2/7
в)
0,2х * (х+0,2) = 0
х=0
и
х+0,2=0
х=-0,2