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p+q = - b/a = - 3/2
pq = c/a = - 7/2
Pk baru
X^2 - (4p+4q)x + 16pq
=x^2 - 4 (p+q)x + 16pq
=x^2 - 4( - 3/2)x + 16* ( - 7/2)
=x^2 + 6x - 56