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Cari faktonya..
Jika dibelakang x² terdapat angka yg lebih besar dari 1, maka ...
... * ... = ac
... + ... = b
... * ... = 5.6
... + ... = 13
10 * 3 = 30
10 + 3 = 13
10 = p
3 = q
a (x + p/a) (x + q/a)
5 (x + 10/5) (x + 3/5)
(5x + 10) (x + 3/5)
x1 = 5x + 10 = 0
x = -10 / 5
x = -2
x2 = x + 3/5 = 0
x = -3/5
Jadi, HP = {-3/5, -2}