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Решение: 1) 6x²-x-1=(2x-1)(3x+1) 2) 6a²+a-2=(3a-2)(2a+1) 3) c²+√2c-4=(c+2√2)(c-√2)

6X^2 - X - 1 D= 1 + 24 = 25 x1 = (1 + 5)/12 = 1/2 x2 = (1 - 5)/12 = - 1/3 (x - 1/2)(x+1/3) 6a^2+a-2 D = 1 + 2*6*4=49 a1 = (-1 +7)/12 = 1/2 a2 = (-1 - 7)/12 = -2/3 (a - 1/2)(a+2/3) C^2 + sqrt(2)C - 4 D = sqrt(2) + 16 C1 = (- sqrt(2) - sqrt(sqrt(2) + 16))/2 C2 = (- sqrt(2) + sqrt(sqrt(2) + 16))/2 (x + (sqrt(2) + sqrt(sqrt(2) + 16))/2)(x - sqrt(sqrt(2) + 16) + sqrt(2))