Question

1) x^2-2x+10=0
2) 3x^2-7x-1=0

Answer 1

X^2 - 2X + 10 = 0
D = 4 - 4*1*10 = 4 - 40 = ( - 36 ) 
D < 0
корней нет
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3X^2 - 7X - 1 = 0 
D = 49 -4*3*(-1) = 49 + 12 = 61 
V D = V 61 
X1 = ( 7 + V 61 ) : 6 = 7/6 + 1/6 V 61 
X2 = 7/6 - 1/6 V 61