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a =1, b= 2m, c= - 4(m+1)
x1 + x2 = -b/a
x1 + x2 = -2m
karena x1 = - 3x2
maka
-3x2 + x2 = -2m
-2x2 = -2m
kedua ruas bagi -2
x2 = m
(x1)(x2) = c/a
(-3x2)(x2) = -4(m+1)
-3 (x2)^2 = -4m - 4
karena x2 = m, maka
-3(m^2) = -4m - 4
-3(m^2) + 4m +4 = 0
kali dengan (-1)
3(m)^2 - 4m -4 = 0
(3m + 2)(m -2) = 0
m = -2/3 atau m =2
disoal "m>0", maka m yang memenuhi adalah m =2
terima kasih