5х^2 - 9х - 2 = 0
a = 5, b = -9, c = -2
D = b^2 - 4ac = (-9)^2 - 4* 5 *(-2) = 81 - (-40) = 81 + 40 = 121 > 0 - уравнение имеет 2 корня
X1 = (-b + √D)/ (2a) = ( -(-9)+√121) / ( 2*5)= (9+11)/10 = 20/10 = 2
X2= (-b - √D)/(2a) = (-(-9)-√121)/(2*5)= (9-11)/10= -2/10= -0,2
Ответ: -0,2; 2
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Answers & Comments
5х^2 - 9х - 2 = 0
a = 5, b = -9, c = -2
D = b^2 - 4ac = (-9)^2 - 4* 5 *(-2) = 81 - (-40) = 81 + 40 = 121 > 0 - уравнение имеет 2 корня
X1 = (-b + √D)/ (2a) = ( -(-9)+√121) / ( 2*5)= (9+11)/10 = 20/10 = 2
X2= (-b - √D)/(2a) = (-(-9)-√121)/(2*5)= (9-11)/10= -2/10= -0,2
Ответ: -0,2; 2