Question

решите уравнение (3х-1)(2х 7)=0

Answer 1

(3x-1)(2x+7)=0
6x²+21x-2x-7=0
6x²+19x-7=0
D=b²-4ac=361+168=529=23²>0
X1=$frac{-b- sqrt{D} }{2a} = frac{-19-23}{12} = frac{42}{12} = frac{14}{4}$
X2=$frac{-b+ sqrt{D} }{2a} = frac{-19+23}{12} = frac{4}{12} = frac{1}{3}$
X1= $frac{14}{4}$ 
X2= $frac{1}{3}$