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(x - 1)(x - 3)
siasa = 3x + 2
f(x) = x³ + 2x² + mx + n
f(1) = 1³ + 2(1)² + m(1) + n = 3(1) + 2
1 + 2 + m + n = 3 + 2
m + n = 3 -+ 2 - 3
m + n = 2 ....pers i
f(3) = 3³ + 2.(3)² + m.(3) + n = 3.(3) + 2
27 + 18 + 3m + n = 9 + 2
3m +n = 11 - 27 - 18
3m + n = - 34 ...pers ii
elemenasi pers i dan ii
m + n = 2 ....pers i
3m + n = - 34 ...pers ii
---------------------- -
- 2m = 36
m = - 36/2
m = - 18
m + n = 2
- 18 + n = 2
n = 2 + 18
n = 20
jadi, m = - 18 dan n = 20