soal akar2 persamaan kuadrat beserta caranya ya

2x kuadrat - 13x - 7
=(2x+1)(x-7)
x = -1/2 v x=7

x2>x1
x2=7
x1 =-1/2

2x1+3x2
=-1+21
=20

    2x² - 13x - 7 = 0
(2x + 1) (x - 7) = 0
2x + 1 = 0     atau    x - 7 = 0
      2x = - 1   atau         x = 7

2x1 + 3x2 = - 1 + 3 .7
                  = - 1 + 21
                  = 20     .... jawaban : D