Question

6 x ( x + 2 ) - 2 x = 20

Answer 1

3x²+6x-x=10

3x²+5x=10

3x²+5x-10=0

x=-5±√5²-4(3)(-10/2(3)

x=-5±√25+120/6

x=-5±√145/6

x1=-5-√145/6

x2=-5+√145/6