susunlah suatu persamaan kuadrat yang akar akarnya -3 dan 2/3

persamaan kuadrat =
ax^2 + bx + c = 0
cara 1
x1 = -3 x2 = 2/3
(x-x1) (x-x2) = 0
(x-(-3)) (x-2/3) = 0
(x+3) (x-2/3) = 0
x^2 + 7/3x - 2 = 0
cara 2
x^2 - (x1 + x2)x + (x1*x2) = 0
x^2 - (-3 + 2/3)x + (-3 * 2/3) = 0
x^2 + 7/3x - 2 = 0