Question

решите уравнение (3x-5)(2x+7)=(3x+1)+4x

Answer 1

(6х+21х-10х-35)=3х+1+4х
17х-35=7х+1
10х=36
х=3.6

Answer 2

(3х-5)(2х+7)=(3х+1)+4х

6х²+21х-10х-35=3х+1+4х

6х²+21х-10х-35-3х-1-4х=0

6х²+4х-36=0|:2

3х²+2х-18=0

х(1,2)=-2±√2²-4*3*(-18)/2*3=
=-2±√220/6

х(1)=-2+√220/6=-2+2√55/6=√55/6
х(2)=-2-√220/6=-2-2√55/6=-4√55/6=-2√55/3